21010521133 has 4 divisors (see below), whose sum is σ = 24012024160. Its totient is φ = 18009018108.

The previous prime is 21010521121. The next prime is 21010521163. The reversal of 21010521133 is 33112501012.

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 21010521133 - 2²¹ = 21008423981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010521133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010521113) 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, 1500751503 + ... + 1500751516.

It is an arithmetic number, because the mean of its divisors is an integer number (6003006040).

Almost surely, 2^21010521133 is an apocalyptic number.

It is an amenable number.

21010521133 is a deficient number, since it is larger than the sum of its proper divisors (3001503027).

21010521133 is an equidigital number, since it uses as much as digits as its factorization.

21010521133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001503026.

The product of its (nonzero) digits is 180, while the sum is 19.

The spelling of 21010521133 in words is "twenty-one billion, ten million, five hundred twenty-one thousand, one hundred thirty-three".