21413212 has 12 divisors (see below), whose sum is σ = 37844856. Its totient is φ = 10600400.

The previous prime is 21413191. The next prime is 21413221. The reversal of 21413212 is 21231412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26098 + ... + 26905.

It is an arithmetic number, because the mean of its divisors is an integer number (3153738).

Almost surely, 2^21413212 is an apocalyptic number.

It is an amenable number.

21413212 is a deficient number, since it is larger than the sum of its proper divisors (16431644).

21413212 is a wasteful number, since it uses less digits than its factorization.

21413212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53108 (or 53106 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21413212 is about 4627.4411935756. The cubic root of 21413212 is about 277.6902334376.

Adding to 21413212 its reverse (21231412), we get a palindrome (42644624).

The spelling of 21413212 in words is "twenty-one million, four hundred thirteen thousand, two hundred twelve".