213561996 has 12 divisors (see below), whose sum is σ = 498311352. Its totient is φ = 71187328.

The previous prime is 213561979. The next prime is 213562009. The reversal of 213561996 is 699165312.

213561996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×213561996² = 91217452271008032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8898405 + ... + 8898428.

It is an arithmetic number, because the mean of its divisors is an integer number (41525946).

Almost surely, 2^213561996 is an apocalyptic number.

It is an amenable number.

213561996 is an abundant number, since it is smaller than the sum of its proper divisors (284749356).

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

213561996 is a wasteful number, since it uses less digits than its factorization.

213561996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17796840 (or 17796838 counting only the distinct ones).

The product of its digits is 87480, while the sum is 42.

The square root of 213561996 is about 14613.7605016642. The cubic root of 213561996 is about 597.7340420527.

The spelling of 213561996 in words is "two hundred thirteen million, five hundred sixty-one thousand, nine hundred ninety-six".