210000122100 has 90 divisors (see below), whose sum is σ = 680737459094. Its totient is φ = 56000030400.

The previous prime is 210000122081. The next prime is 210000122117. The reversal of 210000122100 is 1221000012.

It can be written as a sum of positive squares in 3 ways, for example, as 1675428624 + 208324693476 = 40932^2 + 456426^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 12954871 + ... + 12971070.

Almost surely, 2^210000122100 is an apocalyptic number.

210000122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210000122100 is an abundant number, since it is smaller than the sum of its proper divisors (470737336994).

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

210000122100 is a wasteful number, since it uses less digits than its factorization.

210000122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25925967 (or 25925951 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210000122100 its reverse (1221000012), we get a palindrome (211221122112).

The spelling of 210000122100 in words is "two hundred ten billion, one hundred twenty-two thousand, one hundred".