213121472 has 28 divisors (see below), whose sum is σ = 425973240. Its totient is φ = 105789696.

The previous prime is 213121471. The next prime is 213121477. The reversal of 213121472 is 274121312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3083 + ... + 20874.

It is an arithmetic number, because the mean of its divisors is an integer number (15213330).

Almost surely, 2^213121472 is an apocalyptic number.

It is an amenable number.

213121472 is a deficient number, since it is larger than the sum of its proper divisors (212851768).

213121472 is a wasteful number, since it uses less digits than its factorization.

213121472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24108 (or 24098 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 213121472 is about 14598.6804883181. The cubic root of 213121472 is about 597.3227681132.

Adding to 213121472 its reverse (274121312), we get a palindrome (487242784).

The spelling of 213121472 in words is "two hundred thirteen million, one hundred twenty-one thousand, four hundred seventy-two".