21801622101 has 32 divisors (see below), whose sum is σ = 33961659648. Its totient is φ = 12182883840.

The previous prime is 21801622093. The next prime is 21801622153. The reversal of 21801622101 is 10122610812.

It is not a de Polignac number, because 21801622101 - 2³ = 21801622093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21801622301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172425 + ... + 270801.

It is an arithmetic number, because the mean of its divisors is an integer number (1061301864).

Almost surely, 2^21801622101 is an apocalyptic number.

21801622101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21801622101 is a deficient number, since it is larger than the sum of its proper divisors (12160037547).

21801622101 is a wasteful number, since it uses less digits than its factorization.

21801622101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98621.

The product of its (nonzero) digits is 384, while the sum is 24.

The spelling of 21801622101 in words is "twenty-one billion, eight hundred one million, six hundred twenty-two thousand, one hundred one".