21407452 has 48 divisors (see below), whose sum is σ = 44553600. Its totient is φ = 8890560.

The previous prime is 21407387. The next prime is 21407467. The reversal of 21407452 is 25470412.

It is a super-2 number, since 2×21407452² = 916558002264608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23803 + ... + 24685.

It is an arithmetic number, because the mean of its divisors is an integer number (928200).

Almost surely, 2^21407452 is an apocalyptic number.

21407452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21407452 is an abundant number, since it is smaller than the sum of its proper divisors (23146148).

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

21407452 is a wasteful number, since it uses less digits than its factorization.

21407452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21407452 is about 4626.8187775187. The cubic root of 21407452 is about 277.6653323130.

Adding to 21407452 its reverse (25470412), we get a palindrome (46877864).

The spelling of 21407452 in words is "twenty-one million, four hundred seven thousand, four hundred fifty-two".