21050131 has 8 divisors (see below), whose sum is σ = 22351680. Its totient is φ = 19755648.

The previous prime is 21050111. The next prime is 21050137. The reversal of 21050131 is 13105012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21050131 is a prime.

It is a super-2 number, since 2×21050131² = 886216030234322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050137) 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, 5190 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (2793960).

Almost surely, 2^21050131 is an apocalyptic number.

21050131 is a deficient number, since it is larger than the sum of its proper divisors (1301549).

21050131 is a wasteful number, since it uses less digits than its factorization.

21050131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21050131 is about 4588.0421750459. The cubic root of 21050131 is about 276.1117790954. Note that the first 3 decimals are identical.

Adding to 21050131 its reverse (13105012), we get a palindrome (34155143).

The spelling of 21050131 in words is "twenty-one million, fifty thousand, one hundred thirty-one".