21050525053 has 4 divisors (see below), whose sum is σ = 21247259040. Its totient is φ = 20853791068.

The previous prime is 21050524993. The next prime is 21050525059. The reversal of 21050525053 is 35052505012.

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 21050525053 - 2⁹ = 21050524541 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 (21050525059) 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, 98366833 + ... + 98367046.

It is an arithmetic number, because the mean of its divisors is an integer number (5311814760).

Almost surely, 2^21050525053 is an apocalyptic number.

It is an amenable number.

21050525053 is a deficient number, since it is larger than the sum of its proper divisors (196733987).

21050525053 is a wasteful number, since it uses less digits than its factorization.

21050525053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196733986.

The product of its (nonzero) digits is 7500, while the sum is 28.

The spelling of 21050525053 in words is "twenty-one billion, fifty million, five hundred twenty-five thousand, fifty-three".