21411812 has 6 divisors (see below), whose sum is σ = 37470678. Its totient is φ = 10705904.

The previous prime is 21411811. The next prime is 21411833. The reversal of 21411812 is 21811412.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 763876 = 4544^2 + 874^2 .

It is not an unprimeable number, because it can be changed into a prime (21411811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2676473 + ... + 2676480.

It is an arithmetic number, because the mean of its divisors is an integer number (6245113).

Almost surely, 2^21411812 is an apocalyptic number.

It is an amenable number.

21411812 is a deficient number, since it is larger than the sum of its proper divisors (16058866).

21411812 is a wasteful number, since it uses less digits than its factorization.

21411812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352957 (or 5352955 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

The square root of 21411812 is about 4627.2899195966. The cubic root of 21411812 is about 277.6841814918.

The spelling of 21411812 in words is "twenty-one million, four hundred eleven thousand, eight hundred twelve".