21412152 has 24 divisors (see below), whose sum is σ = 57991440. Its totient is φ = 7137360.

The previous prime is 21412133. The next prime is 21412177. The reversal of 21412152 is 25121412.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21412152² = 916960506542208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148624 + ... + 148767.

It is an arithmetic number, because the mean of its divisors is an integer number (2416310).

Almost surely, 2^21412152 is an apocalyptic number.

It is an amenable number.

21412152 is an abundant number, since it is smaller than the sum of its proper divisors (36579288).

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

21412152 is a wasteful number, since it uses less digits than its factorization.

21412152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297403 (or 297396 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21412152 is about 4627.3266580176. The cubic root of 21412152 is about 277.6856512743.

Adding to 21412152 its reverse (25121412), we get a palindrome (46533564).

The spelling of 21412152 in words is "twenty-one million, four hundred twelve thousand, one hundred fifty-two".