21797084 has 12 divisors (see below), whose sum is σ = 38207400. Its totient is φ = 10880688.

The previous prime is 21797063. The next prime is 21797093. The reversal of 21797084 is 48079712.

It is a super-2 number, since 2×21797084² = 950225741806112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (3183950).

Almost surely, 2^21797084 is an apocalyptic number.

It is an amenable number.

21797084 is a deficient number, since it is larger than the sum of its proper divisors (16410316).

21797084 is a wasteful number, since it uses less digits than its factorization.

21797084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8932 (or 8930 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 21797084 is about 4668.7347322374. The cubic root of 21797084 is about 279.3397880473.

It can be divided in two parts, 2179708 and 4, that added together give a palindrome (2179712).

The spelling of 21797084 in words is "twenty-one million, seven hundred ninety-seven thousand, eighty-four".