21416797 has 4 divisors (see below), whose sum is σ = 21580416. Its totient is φ = 21253180.

The previous prime is 21416779. The next prime is 21416803. The reversal of 21416797 is 79761412.

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 21416797 - 2⁷ = 21416669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416737) 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, 81613 + ... + 81874.

It is an arithmetic number, because the mean of its divisors is an integer number (5395104).

Almost surely, 2^21416797 is an apocalyptic number.

It is an amenable number.

21416797 is a deficient number, since it is larger than the sum of its proper divisors (163619).

21416797 is a wasteful number, since it uses less digits than its factorization.

21416797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163618.

The product of its digits is 21168, while the sum is 37.

The square root of 21416797 is about 4627.8285404712. The cubic root of 21416797 is about 277.7057295394.

The spelling of 21416797 in words is "twenty-one million, four hundred sixteen thousand, seven hundred ninety-seven".