21104900901 has 24 divisors (see below), whose sum is σ = 36354614400. Its totient is φ = 11535597216.

The previous prime is 21104900893. The next prime is 21104900911. The reversal of 21104900901 is 10900940112.

It is not a de Polignac number, because 21104900901 - 2³ = 21104900893 is a prime.

It is a super-2 number, since 2×21104900901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104900911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7281126 + ... + 7284023.

It is an arithmetic number, because the mean of its divisors is an integer number (1514775600).

Almost surely, 2^21104900901 is an apocalyptic number.

21104900901 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21104900901 is a deficient number, since it is larger than the sum of its proper divisors (15249713499).

21104900901 is a wasteful number, since it uses less digits than its factorization.

21104900901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14565185 (or 14565182 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21104900901 in words is "twenty-one billion, one hundred four million, nine hundred thousand, nine hundred one".