21055060220 has 24 divisors (see below), whose sum is σ = 44279643408. Its totient is φ = 8409830400.

The previous prime is 21055060217. The next prime is 21055060231. The reversal of 21055060220 is 2206055012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747941 + ... + 775580.

It is an arithmetic number, because the mean of its divisors is an integer number (1844985142).

Almost surely, 2^21055060220 is an apocalyptic number.

21055060220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21055060220 is an abundant number, since it is smaller than the sum of its proper divisors (23224583188).

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

21055060220 is a wasteful number, since it uses less digits than its factorization.

21055060220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524221 (or 1524219 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 21055060220 in words is "twenty-one billion, fifty-five million, sixty thousand, two hundred twenty".