21162152 has 16 divisors (see below), whose sum is σ = 43286400. Its totient is φ = 9619120.

The previous prime is 21162131. The next prime is 21162157. The reversal of 21162152 is 25126112.

It is a super-2 number, since 2×21162152² = 895673354542208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21162157) 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, 120152 + ... + 120327.

It is an arithmetic number, because the mean of its divisors is an integer number (2705400).

Almost surely, 2^21162152 is an apocalyptic number.

21162152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21162152 is an abundant number, since it is smaller than the sum of its proper divisors (22124248).

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

21162152 is a wasteful number, since it uses less digits than its factorization.

21162152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240496 (or 240492 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 21162152 is about 4600.2339070965. The cubic root of 21162152 is about 276.6007010357.

Adding to 21162152 its reverse (25126112), we get a palindrome (46288264).

The spelling of 21162152 in words is "twenty-one million, one hundred sixty-two thousand, one hundred fifty-two".