21211130100 has 36 divisors (see below), whose sum is σ = 61370870624. Its totient is φ = 5656301280.

The previous prime is 21211130099. The next prime is 21211130123. The reversal of 21211130100 is 103111212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35351584 + ... + 35352183.

Almost surely, 2^21211130100 is an apocalyptic number.

21211130100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211130100 is an abundant number, since it is smaller than the sum of its proper divisors (40159740524).

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

21211130100 is a wasteful number, since it uses less digits than its factorization.

21211130100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70703784 (or 70703777 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21211130100 its reverse (103111212), we get a palindrome (21314241312).

The spelling of 21211130100 in words is "twenty-one billion, two hundred eleven million, one hundred thirty thousand, one hundred".