21272052 has 24 divisors (see below), whose sum is σ = 49900032. Its totient is φ = 7052800.

The previous prime is 21272047. The next prime is 21272099. The reversal of 21272052 is 25027212.

It is a happy number.

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, 2349 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (2079168).

Almost surely, 2^21272052 is an apocalyptic number.

It is an amenable number.

21272052 is an abundant number, since it is smaller than the sum of its proper divisors (28627980).

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

21272052 is a wasteful number, since it uses less digits than its factorization.

21272052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479 (or 9477 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21272052 is about 4612.1634836593. The cubic root of 21272052 is about 277.0786919053.

Adding to 21272052 its reverse (25027212), we get a palindrome (46299264).

The spelling of 21272052 in words is "twenty-one million, two hundred seventy-two thousand, fifty-two".