21211152 has 40 divisors (see below), whose sum is σ = 57180864. Its totient is φ = 6762624.

The previous prime is 21211139. The next prime is 21211181. The reversal of 21211152 is 25111212.

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, 8503 + ... + 10710.

Almost surely, 2^21211152 is an apocalyptic number.

It is an amenable number.

21211152 is an abundant number, since it is smaller than the sum of its proper divisors (35969712).

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

21211152 is a wasteful number, since it uses less digits than its factorization.

21211152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19247 (or 19241 counting only the distinct ones).

The product of its digits is 40, while the sum is 15.

The square root of 21211152 is about 4605.5566438814. The cubic root of 21211152 is about 276.8140219210.

Adding to 21211152 its reverse (25111212), we get a palindrome (46322364).

The spelling of 21211152 in words is "twenty-one million, two hundred eleven thousand, one hundred fifty-two".