213099660 has 60 divisors (see below), whose sum is σ = 668506608. Its totient is φ = 56826144.

The previous prime is 213099659. The next prime is 213099707. The reversal of 213099660 is 66990312.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×213099660² = 90822930184231200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64152 + ... + 67391.

Almost surely, 2^213099660 is an apocalyptic number.

213099660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213099660 is an abundant number, since it is smaller than the sum of its proper divisors (455406948).

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

213099660 is a wasteful number, since it uses less digits than its factorization.

213099660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131564 (or 131553 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 213099660 is about 14597.9334153845. The cubic root of 213099660 is about 597.3023896742.

The spelling of 213099660 in words is "two hundred thirteen million, ninety-nine thousand, six hundred sixty".