21364057 has 8 divisors (see below), whose sum is σ = 25099200. Its totient is φ = 17927760.

The previous prime is 21364009. The next prime is 21364061. The reversal of 21364057 is 75046312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21364057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364657) 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, 74557 + ... + 74842.

It is an arithmetic number, because the mean of its divisors is an integer number (3137400).

Almost surely, 2^21364057 is an apocalyptic number.

It is an amenable number.

21364057 is a deficient number, since it is larger than the sum of its proper divisors (3735143).

21364057 is a wasteful number, since it uses less digits than its factorization.

21364057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149423.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21364057 is about 4622.1268913780. The cubic root of 21364057 is about 277.4775871301.

The spelling of 21364057 in words is "twenty-one million, three hundred sixty-four thousand, fifty-seven".