21343397 has 8 divisors (see below), whose sum is σ = 21701952. Its totient is φ = 20988000.

The previous prime is 21343373. The next prime is 21343429. The reversal of 21343397 is 79334312.

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 21343397 - 2⁸ = 21343141 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 (21343307) 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, 15497 + ... + 16817.

It is an arithmetic number, because the mean of its divisors is an integer number (2712744).

Almost surely, 2^21343397 is an apocalyptic number.

It is an amenable number.

21343397 is a deficient number, since it is larger than the sum of its proper divisors (358555).

21343397 is a wasteful number, since it uses less digits than its factorization.

21343397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579.

The product of its digits is 13608, while the sum is 32.

The square root of 21343397 is about 4619.8914489412. The cubic root of 21343397 is about 277.3881138641.

The spelling of 21343397 in words is "twenty-one million, three hundred forty-three thousand, three hundred ninety-seven".