21797060 has 24 divisors (see below), whose sum is σ = 48467160. Its totient is φ = 8205824.

The previous prime is 21797053. The next prime is 21797063. The reversal of 21797060 is 6079712.

It can be written as a sum of positive squares in 4 ways, for example, as 11710084 + 10086976 = 3422^2 + 3176^2 .

It is a super-2 number, since 2×21797060² = 950223649287200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21797063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31715 + ... + 32394.

It is an arithmetic number, because the mean of its divisors is an integer number (2019465).

Almost surely, 2^21797060 is an apocalyptic number.

21797060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21797060 is an abundant number, since it is smaller than the sum of its proper divisors (26670100).

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

21797060 is a wasteful number, since it uses less digits than its factorization.

21797060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64135 (or 64133 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 21797060 is about 4668.7321619472. The cubic root of 21797060 is about 279.3396855235.

The spelling of 21797060 in words is "twenty-one million, seven hundred ninety-seven thousand, sixty".