21053159 has 12 divisors (see below), whose sum is σ = 22997160. Its totient is φ = 19247760.

The previous prime is 21053129. The next prime is 21053173. The reversal of 21053159 is 95135012.

It is not a de Polignac number, because 21053159 - 2²⁰ = 20004583 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 (21053129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9464 + ... + 11474.

It is an arithmetic number, because the mean of its divisors is an integer number (1916430).

Almost surely, 2^21053159 is an apocalyptic number.

21053159 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21053159 is a deficient number, since it is larger than the sum of its proper divisors (1944001).

21053159 is a wasteful number, since it uses less digits than its factorization.

21053159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 21053159 is about 4588.3721514280. The cubic root of 21053159 is about 276.1250177522.

It can be divided in two parts, 21053 and 159, that added together give a palindrome (21212).

The spelling of 21053159 in words is "twenty-one million, fifty-three thousand, one hundred fifty-nine".