1221232021 has 8 divisors (see below), whose sum is σ = 1281139200. Its totient is φ = 1162511280.

The previous prime is 1221231997. The next prime is 1221232031. The reversal of 1221232021 is 1202321221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221232021 - 2²¹ = 1219134869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221231986 and 1221232004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221232031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294501 + ... + 298618.

It is an arithmetic number, because the mean of its divisors is an integer number (160142400).

Almost surely, 2^1221232021 is an apocalyptic number.

It is an amenable number.

1221232021 is a deficient number, since it is larger than the sum of its proper divisors (59907179).

1221232021 is an equidigital number, since it uses as much as digits as its factorization.

1221232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593219.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221232021 is about 34946.1302721775. The cubic root of 1221232021 is about 1068.8892952238.

Adding to 1221232021 its reverse (1202321221), we get a palindrome (2423553242).

The spelling of 1221232021 in words is "one billion, two hundred twenty-one million, two hundred thirty-two thousand, twenty-one".