21337397 has 8 divisors (see below), whose sum is σ = 22772736. Its totient is φ = 19922112.

The previous prime is 21337369. The next prime is 21337439. The reversal of 21337397 is 79373312.

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 21337397 - 2¹⁸ = 21075253 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 (21337367) 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, 2783 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (2846592).

Almost surely, 2^21337397 is an apocalyptic number.

It is an amenable number.

21337397 is a deficient number, since it is larger than the sum of its proper divisors (1435339).

21337397 is a wasteful number, since it uses less digits than its factorization.

21337397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10027.

The product of its digits is 23814, while the sum is 35.

The square root of 21337397 is about 4619.2420373910. The cubic root of 21337397 is about 277.3621185541.

The spelling of 21337397 in words is "twenty-one million, three hundred thirty-seven thousand, three hundred ninety-seven".