21572152 has 48 divisors (see below), whose sum is σ = 47565360. Its totient is φ = 9144576.

The previous prime is 21572141. The next prime is 21572179. The reversal of 21572152 is 25127512.

It is a super-2 number, since 2×21572152² = 930715483822208, 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 11 ways as a sum of consecutive naturals, for example, 44053 + ... + 44539.

It is an arithmetic number, because the mean of its divisors is an integer number (990945).

Almost surely, 2^21572152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21572152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23782680).

21572152 is an abundant number, since it is smaller than the sum of its proper divisors (25993208).

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

21572152 is a wasteful number, since it uses less digits than its factorization.

21572152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 609 counting only the distinct ones).

The product of its digits is 1400, while the sum is 25.

The square root of 21572152 is about 4644.5830813971. The cubic root of 21572152 is about 278.3755943176.

Adding to 21572152 its reverse (25127512), we get a palindrome (46699664).

The spelling of 21572152 in words is "twenty-one million, five hundred seventy-two thousand, one hundred fifty-two".