252211220 has 24 divisors (see below), whose sum is σ = 532340424. Its totient is φ = 100370816.

The previous prime is 252211217. The next prime is 252211243. The reversal of 252211220 is 22112252.

It can be written as a sum of positive squares in 4 ways, for example, as 184905604 + 67305616 = 13598^2 + 8204^2 .

It is a super-2 number, since 2×252211220² = 127220998987776800, which contains 22 as substring.

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, 28067 + ... + 35946.

It is an arithmetic number, because the mean of its divisors is an integer number (22180851).

Almost surely, 2^252211220 is an apocalyptic number.

252211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252211220 is an abundant number, since it is smaller than the sum of its proper divisors (280129204).

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

252211220 is a wasteful number, since it uses less digits than its factorization.

252211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64219 (or 64217 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 252211220 is about 15881.1592775842. The cubic root of 252211220 is about 631.8123842233.

Adding to 252211220 its reverse (22112252), we get a palindrome (274323472).

The spelling of 252211220 in words is "two hundred fifty-two million, two hundred eleven thousand, two hundred twenty".