21130893 has 12 divisors (see below), whose sum is σ = 34882848. Its totient is φ = 12074760.

The previous prime is 21130891. The next prime is 21130897. The reversal of 21130893 is 39803112.

It is not a de Polignac number, because 21130893 - 2¹ = 21130891 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130891) 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, 167643 + ... + 167768.

It is an arithmetic number, because the mean of its divisors is an integer number (2906904).

Almost surely, 2^21130893 is an apocalyptic number.

It is an amenable number.

21130893 is a deficient number, since it is larger than the sum of its proper divisors (13751955).

21130893 is a wasteful number, since it uses less digits than its factorization.

21130893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335424 (or 335421 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21130893 is about 4596.8351068969. The cubic root of 21130893 is about 276.4644432803.

The spelling of 21130893 in words is "twenty-one million, one hundred thirty thousand, eight hundred ninety-three".