21135592 has 8 divisors (see below), whose sum is σ = 39629250. Its totient is φ = 10567792.

The previous prime is 21135589. The next prime is 21135593. The reversal of 21135592 is 29553112.

It can be written as a sum of positive squares in only one way, i.e., 12574116 + 8561476 = 3546^2 + 2926^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21135592.

It is not an unprimeable number, because it can be changed into a prime (21135593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320967 + ... + 1320982.

Almost surely, 2^21135592 is an apocalyptic number.

It is an amenable number.

21135592 is a deficient number, since it is larger than the sum of its proper divisors (18493658).

21135592 is a wasteful number, since it uses less digits than its factorization.

21135592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641955 (or 2641951 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 21135592 is about 4597.3461910106. The cubic root of 21135592 is about 276.4849347653.

The spelling of 21135592 in words is "twenty-one million, one hundred thirty-five thousand, five hundred ninety-two".