1221321221031 has 8 divisors (see below), whose sum is σ = 1645216215664. Its totient is φ = 805820186880.

The previous prime is 1221321221023. The next prime is 1221321221041. The reversal of 1221321221031 is 1301221231221.

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

It is not a de Polignac number, because 1221321221031 - 2³ = 1221321221023 is a prime.

It is a super-2 number, since 2×1221321221031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221321220989 and 1221321221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221321221041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2098489780 + ... + 2098490361.

It is an arithmetic number, because the mean of its divisors is an integer number (205652026958).

Almost surely, 2^{1221321221031} is an apocalyptic number.

1221321221031 is a deficient number, since it is larger than the sum of its proper divisors (423894994633).

1221321221031 is an equidigital number, since it uses as much as digits as its factorization.

1221321221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196980241.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1221321221031 its reverse (1301221231221), we get a palindrome (2522542452252).

The spelling of 1221321221031 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-one thousand, thirty-one".