21612064 has 24 divisors (see below), whose sum is σ = 42674688. Its totient is φ = 10774080.

The previous prime is 21612061. The next prime is 21612067. The reversal of 21612064 is 46021612.

It is an interprime number because it is at equal distance from previous prime (21612061) and next prime (21612067).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612061) 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, 13009 + ... + 14575.

It is an arithmetic number, because the mean of its divisors is an integer number (1778112).

Almost surely, 2^21612064 is an apocalyptic number.

It is an amenable number.

21612064 is a deficient number, since it is larger than the sum of its proper divisors (21062624).

21612064 is a wasteful number, since it uses less digits than its factorization.

21612064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008 (or 2000 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21612064 is about 4648.8777140295. The cubic root of 21612064 is about 278.5471686334.

Adding to 21612064 its reverse (46021612), we get a palindrome (67633676).

It can be divided in two parts, 2161 and 2064, that added together give a square (4225 = 65²).

The spelling of 21612064 in words is "twenty-one million, six hundred twelve thousand, sixty-four".