21050621133 has 4 divisors (see below), whose sum is σ = 28067494848. Its totient is φ = 14033747420.

The previous prime is 21050621117. The next prime is 21050621167. The reversal of 21050621133 is 33112605012.

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 21050621133 - 2⁴ = 21050621117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050621173) 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, 3508436853 + ... + 3508436858.

It is an arithmetic number, because the mean of its divisors is an integer number (7016873712).

Almost surely, 2^21050621133 is an apocalyptic number.

It is an amenable number.

21050621133 is a deficient number, since it is larger than the sum of its proper divisors (7016873715).

21050621133 is an equidigital number, since it uses as much as digits as its factorization.

21050621133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016873714.

The product of its (nonzero) digits is 1080, while the sum is 24.

The spelling of 21050621133 in words is "twenty-one billion, fifty million, six hundred twenty-one thousand, one hundred thirty-three".