21536694 has 24 divisors (see below), whose sum is σ = 48692592. Its totient is φ = 6866640.

The previous prime is 21536693. The next prime is 21536699. The reversal of 21536694 is 49663512.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25597 + ... + 26424.

It is an arithmetic number, because the mean of its divisors is an integer number (2028858).

Almost surely, 2^21536694 is an apocalyptic number.

21536694 is an abundant number, since it is smaller than the sum of its proper divisors (27155898).

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

21536694 is a wasteful number, since it uses less digits than its factorization.

21536694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52052 (or 52049 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21536694 is about 4640.7643766949. The cubic root of 21536694 is about 278.2229893160. Note that the first 3 decimals are identical.

The spelling of 21536694 in words is "twenty-one million, five hundred thirty-six thousand, six hundred ninety-four".