21590216122 has 16 divisors (see below), whose sum is σ = 32930188200. Its totient is φ = 10614827520.

The previous prime is 21590216113. The next prime is 21590216143. The reversal of 21590216122 is 22161209512.

It can be written as a sum of positive squares in 4 ways, for example, as 3516371401 + 18073844721 = 59299^2 + 134439^2 .

It is a super-2 number, since 2×21590216122² (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, 302847 + ... + 367282.

Almost surely, 2^21590216122 is an apocalyptic number.

21590216122 is a deficient number, since it is larger than the sum of its proper divisors (11339972078).

21590216122 is a wasteful number, since it uses less digits than its factorization.

21590216122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670401.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 21590216122 in words is "twenty-one billion, five hundred ninety million, two hundred sixteen thousand, one hundred twenty-two".