21012020112122 has 16 divisors (see below), whose sum is σ = 35939111323752. Its totient is φ = 9127393351680.

The previous prime is 21012020112101. The next prime is 21012020112199. The reversal of 21012020112122 is 22121102021012.

It can be written as a sum of positive squares in 4 ways, for example, as 14363197994161 + 6648822117961 = 3789881^2 + 2578531^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21012020112122.

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, 23769253079 + ... + 23769253962.

Almost surely, 2^{21012020112122} is an apocalyptic number.

21012020112122 is a deficient number, since it is larger than the sum of its proper divisors (14927091211630).

21012020112122 is a wasteful number, since it uses less digits than its factorization.

21012020112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47538507073.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012020112122 its reverse (22121102021012), we get a palindrome (43133122133134).

The spelling of 21012020112122 in words is "twenty-one trillion, twelve billion, twenty million, one hundred twelve thousand, one hundred twenty-two".