21119157 has 8 divisors (see below), whose sum is σ = 31287680. Its totient is φ = 14079420.

The previous prime is 21119143. The next prime is 21119159. The reversal of 21119157 is 75191112.

It is not a de Polignac number, because 21119157 - 2⁶ = 21119093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 782191 = 21119157 / (2 + 1 + 1 + 1 + 9 + 1 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21119157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119159) 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, 391069 + ... + 391122.

It is an arithmetic number, because the mean of its divisors is an integer number (3910960).

Almost surely, 2^21119157 is an apocalyptic number.

21119157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21119157 is a deficient number, since it is larger than the sum of its proper divisors (10168523).

21119157 is an equidigital number, since it uses as much as digits as its factorization.

21119157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782200 (or 782194 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 21119157 is about 4595.5583991502. The cubic root of 21119157 is about 276.4132514452.

The spelling of 21119157 in words is "twenty-one million, one hundred nineteen thousand, one hundred fifty-seven".