21411612 has 36 divisors (see below), whose sum is σ = 54892656. Its totient is φ = 7035840.

The previous prime is 21411589. The next prime is 21411617. The reversal of 21411612 is 21611412.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1633 + ... + 6744.

It is an arithmetic number, because the mean of its divisors is an integer number (1524796).

Almost surely, 2^21411612 is an apocalyptic number.

It is an amenable number.

21411612 is an abundant number, since it is smaller than the sum of its proper divisors (33481044).

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

21411612 is a wasteful number, since it uses less digits than its factorization.

21411612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8458 (or 8453 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 21411612 is about 4627.2683086244. The cubic root of 21411612 is about 277.6833169065.

The spelling of 21411612 in words is "twenty-one million, four hundred eleven thousand, six hundred twelve".