21762207138 has 32 divisors (see below), whose sum is σ = 49799909376. Its totient is φ = 6210558288.

The previous prime is 21762207119. The next prime is 21762207143. The reversal of 21762207138 is 83170226712.

It is a junction number, because it is equal to n+sod(n) for n = 21762207096 and 21762207105.

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, 263956 + ... + 336447.

It is an arithmetic number, because the mean of its divisors is an integer number (1556247168).

Almost surely, 2^21762207138 is an apocalyptic number.

21762207138 is an abundant number, since it is smaller than the sum of its proper divisors (28037702238).

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

21762207138 is a wasteful number, since it uses less digits than its factorization.

21762207138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601278.

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 21762207138 in words is "twenty-one billion, seven hundred sixty-two million, two hundred seven thousand, one hundred thirty-eight".