21411372 has 12 divisors (see below), whose sum is σ = 49959896. Its totient is φ = 7137120.

The previous prime is 21411361. The next prime is 21411407. The reversal of 21411372 is 27311412.

It is a tau number, because it is divible by the number of its divisors (12).

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, 892129 + ... + 892152.

Almost surely, 2^21411372 is an apocalyptic number.

It is an amenable number.

21411372 is an abundant number, since it is smaller than the sum of its proper divisors (28548524).

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

21411372 is a wasteful number, since it uses less digits than its factorization.

21411372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784288 (or 1784286 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 21411372 is about 4627.2423753246. The cubic root of 21411372 is about 277.6822793972.

Adding to 21411372 its reverse (27311412), we get a palindrome (48722784).

It can be divided in two parts, 214113 and 72, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21411372 in words is "twenty-one million, four hundred eleven thousand, three hundred seventy-two".