21525550100 has 36 divisors (see below), whose sum is σ = 46764756864. Its totient is φ = 8600208480.

The previous prime is 21525550087. The next prime is 21525550103. The reversal of 21525550100 is 105552512.

It is a super-2 number, since 2×21525550100² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21525550100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525550103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38414 + ... + 211013.

It is an arithmetic number, because the mean of its divisors is an integer number (1299021024).

Almost surely, 2^21525550100 is an apocalyptic number.

21525550100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525550100 is an abundant number, since it is smaller than the sum of its proper divisors (25239206764).

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

21525550100 is a wasteful number, since it uses less digits than its factorization.

21525550100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250304 (or 250297 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The spelling of 21525550100 in words is "twenty-one billion, five hundred twenty-five million, five hundred fifty thousand, one hundred".