21535796 has 6 divisors (see below), whose sum is σ = 37687650. Its totient is φ = 10767896.

The previous prime is 21535781. The next prime is 21535837. The reversal of 21535796 is 69753512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 1999396 = 4420^2 + 1414^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691971 + ... + 2691978.

It is an arithmetic number, because the mean of its divisors is an integer number (6281275).

Almost surely, 2^21535796 is an apocalyptic number.

It is an amenable number.

21535796 is a deficient number, since it is larger than the sum of its proper divisors (16151854).

21535796 is a wasteful number, since it uses less digits than its factorization.

21535796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383953 (or 5383951 counting only the distinct ones).

The product of its digits is 56700, while the sum is 38.

The square root of 21535796 is about 4640.6676243834. The cubic root of 21535796 is about 278.2191223078.

The spelling of 21535796 in words is "twenty-one million, five hundred thirty-five thousand, seven hundred ninety-six".