10521139 has 4 divisors (see below), whose sum is σ = 10533600. Its totient is φ = 10508680.

The previous prime is 10521107. The next prime is 10521149. The reversal of 10521139 is 93112501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10521139 - 2⁵ = 10521107 is a prime.

It is a super-2 number, since 2×10521139² = 221388731714642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10521149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4864 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (2633400).

Almost surely, 2^10521139 is an apocalyptic number.

10521139 is a deficient number, since it is larger than the sum of its proper divisors (12461).

10521139 is an equidigital number, since it uses as much as digits as its factorization.

10521139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12460.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 10521139 is about 3243.6305276649. The cubic root of 10521139 is about 219.1228087355.

The spelling of 10521139 in words is "ten million, five hundred twenty-one thousand, one hundred thirty-nine".