21032797 has 4 divisors (see below), whose sum is σ = 21069216. Its totient is φ = 20996380.

The previous prime is 21032789. The next prime is 21032807. The reversal of 21032797 is 79723012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21032797 - 2³ = 21032789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17329 + ... + 18502.

It is an arithmetic number, because the mean of its divisors is an integer number (5267304).

Almost surely, 2^21032797 is an apocalyptic number.

It is an amenable number.

21032797 is a deficient number, since it is larger than the sum of its proper divisors (36419).

21032797 is an equidigital number, since it uses as much as digits as its factorization.

21032797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36418.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21032797 is about 4586.1527449486. The cubic root of 21032797 is about 276.0359690222.

It can be divided in two parts, 2103 and 2797, that added together give a square (4900 = 70²).

The spelling of 21032797 in words is "twenty-one million, thirty-two thousand, seven hundred ninety-seven".