21612933 has 16 divisors (see below), whose sum is σ = 33903360. Its totient is φ = 13560768.

The previous prime is 21612931. The next prime is 21612947. The reversal of 21612933 is 33921612.

It is not a de Polignac number, because 21612933 - 2¹ = 21612931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21612897 and 21612906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23085 + ... + 24002.

It is an arithmetic number, because the mean of its divisors is an integer number (2118960).

Almost surely, 2^21612933 is an apocalyptic number.

It is an amenable number.

21612933 is a deficient number, since it is larger than the sum of its proper divisors (12290427).

21612933 is a wasteful number, since it uses less digits than its factorization.

21612933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47113 (or 47107 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21612933 is about 4648.9711765078. The cubic root of 21612933 is about 278.5509019533.

The spelling of 21612933 in words is "twenty-one million, six hundred twelve thousand, nine hundred thirty-three".