21357079 has 8 divisors (see below), whose sum is σ = 22145760. Its totient is φ = 20571936.

The previous prime is 21357071. The next prime is 21357101. The reversal of 21357079 is 97075312.

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 21357079 - 2³ = 21357071 is a prime.

It is a super-2 number, since 2×21357079² = 912249646824482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357071) 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, 20577 + ... + 21589.

It is an arithmetic number, because the mean of its divisors is an integer number (2768220).

Almost surely, 2^21357079 is an apocalyptic number.

21357079 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21357079 is a deficient number, since it is larger than the sum of its proper divisors (788681).

21357079 is a wasteful number, since it uses less digits than its factorization.

21357079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 21357079 is about 4621.3719824312. The cubic root of 21357079 is about 277.4473736201.

The spelling of 21357079 in words is "twenty-one million, three hundred fifty-seven thousand, seventy-nine".