21021031330093 has 4 divisors (see below), whose sum is σ = 21037492593180. Its totient is φ = 21004570067008.

The previous prime is 21021031330073. The next prime is 21021031330139. The reversal of 21021031330093 is 39003313012012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5623741902249 + 15397289427844 = 2371443^2 + 3923938^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021031330093 - 2⁹ = 21021031329581 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 (21021031330043) 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, 8230629628 + ... + 8230632181.

It is an arithmetic number, because the mean of its divisors is an integer number (5259373148295).

Almost surely, 2^{21021031330093} is an apocalyptic number.

It is an amenable number.

21021031330093 is a deficient number, since it is larger than the sum of its proper divisors (16461263087).

21021031330093 is a wasteful number, since it uses less digits than its factorization.

21021031330093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16461263086.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 21021031330093 in words is "twenty-one trillion, twenty-one billion, thirty-one million, three hundred thirty thousand, ninety-three".