213421944 has 32 divisors (see below), whose sum is σ = 564941520. Its totient is φ = 66955776.

The previous prime is 213421913. The next prime is 213421951. The reversal of 213421944 is 449124312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261139 + ... + 261954.

Almost surely, 2^213421944 is an apocalyptic number.

213421944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213421944 is an abundant number, since it is smaller than the sum of its proper divisors (351519576).

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

213421944 is a wasteful number, since it uses less digits than its factorization.

213421944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523119 (or 523115 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 213421944 is about 14608.9679306924. The cubic root of 213421944 is about 597.6033506440.

The spelling of 213421944 in words is "two hundred thirteen million, four hundred twenty-one thousand, nine hundred forty-four".