213329991 has 32 divisors (see below), whose sum is σ = 359175168. Its totient is φ = 109739520.

The previous prime is 213329983. The next prime is 213330023. The reversal of 213329991 is 199923312.

213329991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213329991 - 2³ = 213329983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213329951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4780 + ... + 21201.

It is an arithmetic number, because the mean of its divisors is an integer number (11224224).

Almost surely, 2^213329991 is an apocalyptic number.

213329991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213329991 is a deficient number, since it is larger than the sum of its proper divisors (145845177).

213329991 is a wasteful number, since it uses less digits than its factorization.

213329991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26031.

The product of its digits is 26244, while the sum is 39.

The square root of 213329991 is about 14605.8204493962. The cubic root of 213329991 is about 597.5175123687.

The spelling of 213329991 in words is "two hundred thirteen million, three hundred twenty-nine thousand, nine hundred ninety-one".