1221110232144 has 80 divisors (see below), whose sum is σ = 3489779925504. Its totient is φ = 364821654400.

The previous prime is 1221110232127. The next prime is 1221110232187. The reversal of 1221110232144 is 4412320111221.

It is a super-2 number, since 2×1221110232144² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16249194 + ... + 16324169.

Almost surely, 2^{1221110232144} is an apocalyptic number.

It is an amenable number.

1221110232144 is an abundant number, since it is smaller than the sum of its proper divisors (2268669693360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221110232144 is a wasteful number, since it uses less digits than its factorization.

1221110232144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32573456 (or 32573450 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 1221110232144 its reverse (4412320111221), we get a palindrome (5633430343365).

The spelling of 1221110232144 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred thirty-two thousand, one hundred forty-four".