21130149 has 4 divisors (see below), whose sum is σ = 28173536. Its totient is φ = 14086764.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130149 is 94103112.

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 de Polignac number, because none of the positive numbers 2^k-21130149 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 (21130049) 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, 3521689 + ... + 3521694.

It is an arithmetic number, because the mean of its divisors is an integer number (7043384).

Almost surely, 2^21130149 is an apocalyptic number.

It is an amenable number.

21130149 is a deficient number, since it is larger than the sum of its proper divisors (7043387).

21130149 is an equidigital number, since it uses as much as digits as its factorization.

21130149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043386.

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

The square root of 21130149 is about 4596.7541809412. The cubic root of 21130149 is about 276.4611985529.

The spelling of 21130149 in words is "twenty-one million, one hundred thirty thousand, one hundred forty-nine".