213225428 has 12 divisors (see below), whose sum is σ = 401848020. Its totient is φ = 98411712.

The previous prime is 213225403. The next prime is 213225437. The reversal of 213225428 is 824522312.

It can be written as a sum of positive squares in 2 ways, for example, as 115175824 + 98049604 = 10732^2 + 9902^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213225428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050193 + ... + 2050296.

It is an arithmetic number, because the mean of its divisors is an integer number (33487335).

Almost surely, 2^213225428 is an apocalyptic number.

It is an amenable number.

213225428 is a deficient number, since it is larger than the sum of its proper divisors (188622592).

213225428 is a wasteful number, since it uses less digits than its factorization.

213225428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100506 (or 4100504 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 213225428 is about 14602.2405130172. The cubic root of 213225428 is about 597.4198726605.

The spelling of 213225428 in words is "two hundred thirteen million, two hundred twenty-five thousand, four hundred twenty-eight".