21132220100 has 18 divisors (see below), whose sum is σ = 45856917834. Its totient is φ = 8452888000.

The previous prime is 21132220079. The next prime is 21132220121. The reversal of 21132220100 is 102223112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21132220079) and next prime (21132220121).

It can be written as a sum of positive squares in 3 ways, for example, as 204547204 + 20927672896 = 14302^2 + 144664^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105661001 + ... + 105661200.

Almost surely, 2^21132220100 is an apocalyptic number.

21132220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132220100 is an abundant number, since it is smaller than the sum of its proper divisors (24724697734).

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

21132220100 is a wasteful number, since it uses less digits than its factorization.

21132220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211322215 (or 211322208 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21132220100 its reverse (102223112), we get a palindrome (21234443212).

The spelling of 21132220100 in words is "twenty-one billion, one hundred thirty-two million, two hundred twenty thousand, one hundred".