21692797 has 8 divisors (see below), whose sum is σ = 25091136. Its totient is φ = 18369312.

The previous prime is 21692773. The next prime is 21692807. The reversal of 21692797 is 79729612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21692797 - 2¹⁹ = 21168509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632797) 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, 18088 + ... + 19249.

It is an arithmetic number, because the mean of its divisors is an integer number (3136392).

Almost surely, 2^21692797 is an apocalyptic number.

It is an amenable number.

21692797 is a deficient number, since it is larger than the sum of its proper divisors (3398339).

21692797 is an equidigital number, since it uses as much as digits as its factorization.

21692797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37427.

The product of its digits is 95256, while the sum is 43.

The square root of 21692797 is about 4657.5526835453. The cubic root of 21692797 is about 278.8935801700.

The spelling of 21692797 in words is "twenty-one million, six hundred ninety-two thousand, seven hundred ninety-seven".