21157327 has 8 divisors (see below), whose sum is σ = 22215600. Its totient is φ = 20121024.

The previous prime is 21157319. The next prime is 21157343. The reversal of 21157327 is 72375112.

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 21157327 - 2³ = 21157319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21157295 and 21157304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157387) 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, 3502 + ... + 7387.

It is an arithmetic number, because the mean of its divisors is an integer number (2776950).

Almost surely, 2^21157327 is an apocalyptic number.

21157327 is a deficient number, since it is larger than the sum of its proper divisors (1058273).

21157327 is a wasteful number, since it uses less digits than its factorization.

21157327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985.

The product of its digits is 2940, while the sum is 28.

The square root of 21157327 is about 4599.7094473456. The cubic root of 21157327 is about 276.5796776567.

It can be divided in two parts, 211573 and 27, that added together give a square (211600 = 460²).

The spelling of 21157327 in words is "twenty-one million, one hundred fifty-seven thousand, three hundred twenty-seven".