21935736 has 24 divisors (see below), whose sum is σ = 59409480. Its totient is φ = 7311888.

The previous prime is 21935731. The next prime is 21935743. The reversal of 21935736 is 63753912.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21935736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21935731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152260 + ... + 152403.

It is an arithmetic number, because the mean of its divisors is an integer number (2475395).

Almost surely, 2^21935736 is an apocalyptic number.

It is an amenable number.

21935736 is an abundant number, since it is smaller than the sum of its proper divisors (37473744).

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

21935736 is a wasteful number, since it uses less digits than its factorization.

21935736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304675 (or 304668 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21935736 is about 4683.5601843042. The cubic root of 21935736 is about 279.9308332557.

The spelling of 21935736 in words is "twenty-one million, nine hundred thirty-five thousand, seven hundred thirty-six".