21613932 has 96 divisors (see below), whose sum is σ = 59404800. Its totient is φ = 6785856.

The previous prime is 21613931. The next prime is 21613973. The reversal of 21613932 is 23931612.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 21613896 and 21613905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613931) 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 31 ways as a sum of consecutive naturals, for example, 209793 + ... + 209895.

It is an arithmetic number, because the mean of its divisors is an integer number (618800).

Almost surely, 2^21613932 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21613932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29702400).

21613932 is an abundant number, since it is smaller than the sum of its proper divisors (37790868).

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

21613932 is a wasteful number, since it uses less digits than its factorization.

21613932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 204 counting only the distinct ones).

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

The square root of 21613932 is about 4649.0786183931. The cubic root of 21613932 is about 278.5551936439. Note that the first 3 decimals are identical.

The spelling of 21613932 in words is "twenty-one million, six hundred thirteen thousand, nine hundred thirty-two".