213621972 has 24 divisors (see below), whose sum is σ = 510609792. Its totient is φ = 69470400.

The previous prime is 213621971. The next prime is 213621973. The reversal of 213621972 is 279126312.

It is an interprime number because it is at equal distance from previous prime (213621971) and next prime (213621973).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213621971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216604 + ... + 217587.

It is an arithmetic number, because the mean of its divisors is an integer number (21275408).

Almost surely, 2^213621972 is an apocalyptic number.

It is an amenable number.

213621972 is an abundant number, since it is smaller than the sum of its proper divisors (296987820).

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

213621972 is a wasteful number, since it uses less digits than its factorization.

213621972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434239 (or 434237 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 213621972 is about 14615.8123961687. The cubic root of 213621972 is about 597.7899919910.

The spelling of 213621972 in words is "two hundred thirteen million, six hundred twenty-one thousand, nine hundred seventy-two".