1220231021 has 4 divisors (see below), whose sum is σ = 1259593344. Its totient is φ = 1180868700.

The previous prime is 1220231017. The next prime is 1220231027. The reversal of 1220231021 is 1201320221.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1220231021 - 2² = 1220231017 is a prime.

It is a super-2 number, since 2×1220231021² = 2977927489221404882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220230987 and 1220231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220231027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19681115 + ... + 19681176.

It is an arithmetic number, because the mean of its divisors is an integer number (314898336).

Almost surely, 2^1220231021 is an apocalyptic number.

It is an amenable number.

1220231021 is a deficient number, since it is larger than the sum of its proper divisors (39362323).

1220231021 is an equidigital number, since it uses as much as digits as its factorization.

1220231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39362322.

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

The square root of 1220231021 is about 34931.8052925983. The cubic root of 1220231021 is about 1068.5971720142.

Adding to 1220231021 its reverse (1201320221), we get a palindrome (2421551242).

The spelling of 1220231021 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, twenty-one".