1302221021 has 4 divisors (see below), whose sum is σ = 1302296892. Its totient is φ = 1302145152.

The previous prime is 1302221003. The next prime is 1302221051. The reversal of 1302221021 is 1201222031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 238548025 + 1063672996 = 15445^2 + 32614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1302221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302220987 and 1302221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421 + ... + 51053.

It is an arithmetic number, because the mean of its divisors is an integer number (325574223).

Almost surely, 2^1302221021 is an apocalyptic number.

It is an amenable number.

1302221021 is a deficient number, since it is larger than the sum of its proper divisors (75871).

1302221021 is an equidigital number, since it uses as much as digits as its factorization.

1302221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75870.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1302221021 is about 36086.2996301921. The cubic root of 1302221021 is about 1092.0140695656.

Adding to 1302221021 its reverse (1201222031), we get a palindrome (2503443052).

It can be divided in two parts, 13022 and 21021, that added together give a palindrome (34043).

The spelling of 1302221021 in words is "one billion, three hundred two million, two hundred twenty-one thousand, twenty-one".