252021132 has 132 divisors (see below), whose sum is σ = 729132936. Its totient is φ = 75582720.

The previous prime is 252021113. The next prime is 252021157. The reversal of 252021132 is 231120252.

It is a tau number, because it is divible by the number of its divisors (132).

It is a super-2 number, since 2×252021132² = 127029301949122848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 2598108 + ... + 2598204.

Almost surely, 2^252021132 is an apocalyptic number.

252021132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 252021132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364566468).

252021132 is an abundant number, since it is smaller than the sum of its proper divisors (477111804).

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

252021132 is an equidigital number, since it uses as much as digits as its factorization.

252021132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 252021132 is about 15875.1734478714. The cubic root of 252021132 is about 631.6536150011.

Adding to 252021132 its reverse (231120252), we get a palindrome (483141384).

The spelling of 252021132 in words is "two hundred fifty-two million, twenty-one thousand, one hundred thirty-two".