21235754220 has 48 divisors (see below), whose sum is σ = 60128218080. Its totient is φ = 5599238656.

The previous prime is 21235754209. The next prime is 21235754227. The reversal of 21235754220 is 2245753212.

It is not an unprimeable number, because it can be changed into a prime (21235754227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1983027 + ... + 1993706.

It is an arithmetic number, because the mean of its divisors is an integer number (1252671210).

Almost surely, 2^21235754220 is an apocalyptic number.

21235754220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21235754220 is an abundant number, since it is smaller than the sum of its proper divisors (38892463860).

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

21235754220 is a wasteful number, since it uses less digits than its factorization.

21235754220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976834 (or 3976832 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The spelling of 21235754220 in words is "twenty-one billion, two hundred thirty-five million, seven hundred fifty-four thousand, two hundred twenty".