21244031416 has 16 divisors (see below), whose sum is σ = 41117480640. Its totient is φ = 10279369920.

The previous prime is 21244031399. The next prime is 21244031429. The reversal of 21244031416 is 61413044212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42830461 + ... + 42830956.

It is an arithmetic number, because the mean of its divisors is an integer number (2569842540).

Almost surely, 2^21244031416 is an apocalyptic number.

It is an amenable number.

21244031416 is a deficient number, since it is larger than the sum of its proper divisors (19873449224).

21244031416 is a wasteful number, since it uses less digits than its factorization.

21244031416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85661454 (or 85661450 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21244031416 its reverse (61413044212), we get a palindrome (82657075628).

The spelling of 21244031416 in words is "twenty-one billion, two hundred forty-four million, thirty-one thousand, four hundred sixteen".