21755505122 has 16 divisors (see below), whose sum is σ = 35454517560. Its totient is φ = 9952142592.

The previous prime is 21755505119. The next prime is 21755505133. The reversal of 21755505122 is 22150555712.

It can be written as a sum of positive squares in 4 ways, for example, as 13151273041 + 8604232081 = 114679^2 + 92759^2 .

It is a super-2 number, since 2×21755505122² (a number of 21 digits) contains 22 as substring.

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, 3699497 + ... + 3705372.

Almost surely, 2^21755505122 is an apocalyptic number.

21755505122 is a deficient number, since it is larger than the sum of its proper divisors (13699012438).

21755505122 is a wasteful number, since it uses less digits than its factorization.

21755505122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7404997.

The product of its (nonzero) digits is 35000, while the sum is 35.

The spelling of 21755505122 in words is "twenty-one billion, seven hundred fifty-five million, five hundred five thousand, one hundred twenty-two".