1302150021 has 4 divisors (see below), whose sum is σ = 1736200032. Its totient is φ = 868100012.

The previous prime is 1302149987. The next prime is 1302150029. The reversal of 1302150021 is 1200512031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200512031 = 3 ⋅400170677.

It is a cyclic number.

It is not a de Polignac number, because 1302150021 - 2⁶ = 1302149957 is a prime.

It is a super-3 number, since 3×1302150021³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302150029) 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, 217025001 + ... + 217025006.

It is an arithmetic number, because the mean of its divisors is an integer number (434050008).

Almost surely, 2^1302150021 is an apocalyptic number.

It is an amenable number.

1302150021 is a deficient number, since it is larger than the sum of its proper divisors (434050011).

1302150021 is an equidigital number, since it uses as much as digits as its factorization.

1302150021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434050010.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1302150021 is about 36085.3158639356. The cubic root of 1302150021 is about 1091.9942228558.

Adding to 1302150021 its reverse (1200512031), we get a palindrome (2502662052).

The spelling of 1302150021 in words is "one billion, three hundred two million, one hundred fifty thousand, twenty-one".