21771715122 has 48 divisors (see below), whose sum is σ = 48348099072. Its totient is φ = 7076495040.

The previous prime is 21771715109. The next prime is 21771715127. The reversal of 21771715122 is 22151717712.

It is a happy number.

21771715122 is a `hidden beast` number, since 2 + 1 + 7 + 71 + 71 + 512 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21771715127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1622083 + ... + 1635449.

It is an arithmetic number, because the mean of its divisors is an integer number (1007252064).

Almost surely, 2^21771715122 is an apocalyptic number.

21771715122 is an abundant number, since it is smaller than the sum of its proper divisors (26576383950).

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

21771715122 is a wasteful number, since it uses less digits than its factorization.

21771715122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15623 (or 15620 counting only the distinct ones).

The product of its digits is 13720, while the sum is 36.

The spelling of 21771715122 in words is "twenty-one billion, seven hundred seventy-one million, seven hundred fifteen thousand, one hundred twenty-two".