213221432 has 8 divisors (see below), whose sum is σ = 399790200. Its totient is φ = 106610712.

The previous prime is 213221419. The next prime is 213221447. The reversal of 213221432 is 234122312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13326332 + ... + 13326347.

It is an arithmetic number, because the mean of its divisors is an integer number (49973775).

Almost surely, 2^213221432 is an apocalyptic number.

It is an amenable number.

213221432 is a deficient number, since it is larger than the sum of its proper divisors (186568768).

213221432 is a wasteful number, since it uses less digits than its factorization.

213221432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26652685 (or 26652681 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 213221432 is about 14602.1036840587. The cubic root of 213221432 is about 597.4161406091.

Adding to 213221432 its reverse (234122312), we get a palindrome (447343744).

The spelling of 213221432 in words is "two hundred thirteen million, two hundred twenty-one thousand, four hundred thirty-two".