1221025240331 has 4 divisors (see below), whose sum is σ = 1314950258832. Its totient is φ = 1127100221832.

The previous prime is 1221025240319. The next prime is 1221025240361. The reversal of 1221025240331 is 1330425201221.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1221025240331 is a prime.

It is a super-2 number, since 2×1221025240331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221025240331.

It is not an unprimeable number, because it can be changed into a prime (1221025240361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46962509231 + ... + 46962509256.

It is an arithmetic number, because the mean of its divisors is an integer number (328737564708).

Almost surely, 2^{1221025240331} is an apocalyptic number.

1221025240331 is a deficient number, since it is larger than the sum of its proper divisors (93925018501).

1221025240331 is an equidigital number, since it uses as much as digits as its factorization.

1221025240331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93925018500.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 1221025240331 in words is "one trillion, two hundred twenty-one billion, twenty-five million, two hundred forty thousand, three hundred thirty-one".