21054051100 has 36 divisors (see below), whose sum is σ = 45710379904. Its totient is φ = 8417364480.

The previous prime is 21054051079. The next prime is 21054051143. The reversal of 21054051100 is 115045012.

It is a super-2 number, since 2×21054051100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149509 + ... + 253891.

Almost surely, 2^21054051100 is an apocalyptic number.

21054051100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21054051100 is an abundant number, since it is smaller than the sum of its proper divisors (24656328804).

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

21054051100 is a wasteful number, since it uses less digits than its factorization.

21054051100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106414 (or 106407 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 21054051100 its reverse (115045012), we get a palindrome (21169096112).

The spelling of 21054051100 in words is "twenty-one billion, fifty-four million, fifty-one thousand, one hundred".