21131049 has 8 divisors (see below), whose sum is σ = 28211040. Its totient is φ = 14069216.

The previous prime is 21131041. The next prime is 21131069. The reversal of 21131049 is 94013112.

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 21131049 - 2³ = 21131041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21131041) 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, 1539 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (3526380).

Almost surely, 2^21131049 is an apocalyptic number.

It is an amenable number.

21131049 is a deficient number, since it is larger than the sum of its proper divisors (7079991).

21131049 is an equidigital number, since it uses as much as digits as its factorization.

21131049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21131049 is about 4596.8520750618. The cubic root of 21131049 is about 276.4651236167.

The spelling of 21131049 in words is "twenty-one million, one hundred thirty-one thousand, forty-nine".