213640424220 has 72 divisors (see below), whose sum is σ = 619531973424. Its totient is φ = 55006257152.

The previous prime is 213640424183. The next prime is 213640424281. The reversal of 213640424220 is 22424046312.

213640424220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2066469 + ... + 2167388.

It is an arithmetic number, because the mean of its divisors is an integer number (8604610742).

Almost surely, 2^213640424220 is an apocalyptic number.

213640424220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213640424220 is an abundant number, since it is smaller than the sum of its proper divisors (405891549204).

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

213640424220 is a wasteful number, since it uses less digits than its factorization.

213640424220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233927 (or 4233896 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The spelling of 213640424220 in words is "two hundred thirteen billion, six hundred forty million, four hundred twenty-four thousand, two hundred twenty".