21354412 has 12 divisors (see below), whose sum is σ = 38575936. Its totient is φ = 10332720.

The previous prime is 21354409. The next prime is 21354413. The reversal of 21354412 is 21445312.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21354413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85983 + ... + 86230.

Almost surely, 2^21354412 is an apocalyptic number.

It is an amenable number.

21354412 is a deficient number, since it is larger than the sum of its proper divisors (17221524).

21354412 is a wasteful number, since it uses less digits than its factorization.

21354412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172248 (or 172246 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21354412 is about 4621.0834227484. The cubic root of 21354412 is about 277.4358242419.

Adding to 21354412 its reverse (21445312), we get a palindrome (42799724).

The spelling of 21354412 in words is "twenty-one million, three hundred fifty-four thousand, four hundred twelve".