21110431144 has 32 divisors (see below), whose sum is σ = 43266363840. Its totient is φ = 9576553600.

The previous prime is 21110431127. The next prime is 21110431151. The reversal of 21110431144 is 44113401112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194197 + ... + 282724.

It is an arithmetic number, because the mean of its divisors is an integer number (1352073870).

Almost surely, 2^21110431144 is an apocalyptic number.

It is an amenable number.

21110431144 is an abundant number, since it is smaller than the sum of its proper divisors (22155932696).

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

21110431144 is a wasteful number, since it uses less digits than its factorization.

21110431144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477441 (or 477437 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21110431144 its reverse (44113401112), we get a palindrome (65223832256).

It can be divided in two parts, 21110 and 431144, that added together give a palindrome (452254).

The spelling of 21110431144 in words is "twenty-one billion, one hundred ten million, four hundred thirty-one thousand, one hundred forty-four".