21302311021 has 8 divisors (see below), whose sum is σ = 22410381600. Its totient is φ = 20219141040.

The previous prime is 21302311007. The next prime is 21302311027. The reversal of 21302311021 is 12011320312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21302311021 - 2⁷ = 21302310893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302310986 and 21302311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302311027) 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, 6223395 + ... + 6226816.

It is an arithmetic number, because the mean of its divisors is an integer number (2801297700).

Almost surely, 2^21302311021 is an apocalyptic number.

It is an amenable number.

21302311021 is a deficient number, since it is larger than the sum of its proper divisors (1108070579).

21302311021 is a wasteful number, since it uses less digits than its factorization.

21302311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12450299.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21302311021 its reverse (12011320312), we get a palindrome (33313631333).

The spelling of 21302311021 in words is "twenty-one billion, three hundred two million, three hundred eleven thousand, twenty-one".