21902077438 has 16 divisors (see below), whose sum is σ = 32903179776. Its totient is φ = 10934365600.

The previous prime is 21902077429. The next prime is 21902077441. The reversal of 21902077438 is 83477020912.

It is a super-2 number, since 2×21902077438² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21902077394 and 21902077403.

It is a congruent number.

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, 6197520 + ... + 6201052.

It is an arithmetic number, because the mean of its divisors is an integer number (2056448736).

Almost surely, 2^21902077438 is an apocalyptic number.

21902077438 is a deficient number, since it is larger than the sum of its proper divisors (11001102338).

21902077438 is a wasteful number, since it uses less digits than its factorization.

21902077438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 21902077438 in words is "twenty-one billion, nine hundred two million, seventy-seven thousand, four hundred thirty-eight".