21030113129 has 4 divisors (see below), whose sum is σ = 21030450576. Its totient is φ = 21029775684.

The previous prime is 21030113123. The next prime is 21030113141. The reversal of 21030113129 is 92131103012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21030113129 - 2¹² = 21030109033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030113123) 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, 44999 + ... + 209964.

It is an arithmetic number, because the mean of its divisors is an integer number (5257612644).

Almost surely, 2^21030113129 is an apocalyptic number.

It is an amenable number.

21030113129 is a deficient number, since it is larger than the sum of its proper divisors (337447).

21030113129 is an equidigital number, since it uses as much as digits as its factorization.

21030113129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337446.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21030113129 in words is "twenty-one billion, thirty million, one hundred thirteen thousand, one hundred twenty-nine".