21133430100 has 54 divisors (see below), whose sum is σ = 66241565390. Its totient is φ = 5635581120.

The previous prime is 21133430093. The next prime is 21133430137. The reversal of 21133430100 is 103433112.

21133430100 is a `hidden beast` number, since 2 + 1 + 133 + 430 + 100 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 153066384 + 20980363716 = 12372^2 + 144846^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11739895 + ... + 11741694.

Almost surely, 2^21133430100 is an apocalyptic number.

21133430100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133430100 is an abundant number, since it is smaller than the sum of its proper divisors (45108135290).

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

21133430100 is a wasteful number, since it uses less digits than its factorization.

21133430100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23481609 (or 23481599 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21133430100 its reverse (103433112), we get a palindrome (21236863212).

The spelling of 21133430100 in words is "twenty-one billion, one hundred thirty-three million, four hundred thirty thousand, one hundred".