21000302300021 has 8 divisors (see below), whose sum is σ = 23297715957600. Its totient is φ = 18767604520240.

The previous prime is 21000302300009. The next prime is 21000302300053. The reversal of 21000302300021 is 12000320300012.

It is a happy number.

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-21000302300021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21000302299969 and 21000302300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000301300021) 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, 16178968766 + ... + 16178970063.

It is an arithmetic number, because the mean of its divisors is an integer number (2912214494700).

Almost surely, 2^{21000302300021} is an apocalyptic number.

It is an amenable number.

21000302300021 is a deficient number, since it is larger than the sum of its proper divisors (2297413657579).

21000302300021 is a wasteful number, since it uses less digits than its factorization.

21000302300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32357938899.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000302300021 its reverse (12000320300012), we get a palindrome (33000622600033).

Subtracting from 21000302300021 its reverse (12000320300012), we obtain a square (8999982000009 = 2999997²).

The spelling of 21000302300021 in words is "twenty-one trillion, three hundred two million, three hundred thousand, twenty-one".