21165452 has 36 divisors (see below), whose sum is σ = 47008584. Its totient is φ = 8245440.

The previous prime is 21165427. The next prime is 21165457. The reversal of 21165452 is 25456112.

It is not an unprimeable number, because it can be changed into a prime (21165457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2753 + ... + 7064.

It is an arithmetic number, because the mean of its divisors is an integer number (1305794).

Almost surely, 2^21165452 is an apocalyptic number.

21165452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21165452 is an abundant number, since it is smaller than the sum of its proper divisors (25843132).

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

21165452 is a wasteful number, since it uses less digits than its factorization.

21165452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9846 (or 9837 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 21165452 is about 4600.5925705283. The cubic root of 21165452 is about 276.6150778797.

The spelling of 21165452 in words is "twenty-one million, one hundred sixty-five thousand, four hundred fifty-two".