21302310021 has 8 divisors (see below), whose sum is σ = 29319308544. Its totient is φ = 13743425760.

The previous prime is 21302310019. The next prime is 21302310041. The reversal of 21302310021 is 12001320312.

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

It is not a de Polignac number, because 21302310021 - 2¹ = 21302310019 is a prime.

It is a super-3 number, since 3×21302310021³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302310041) 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, 114528456 + ... + 114528641.

It is an arithmetic number, because the mean of its divisors is an integer number (3664913568).

Almost surely, 2^21302310021 is an apocalyptic number.

It is an amenable number.

21302310021 is a deficient number, since it is larger than the sum of its proper divisors (8016998523).

21302310021 is a wasteful number, since it uses less digits than its factorization.

21302310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229057131.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21302310021 its reverse (12001320312), we get a palindrome (33303630333).

The spelling of 21302310021 in words is "twenty-one billion, three hundred two million, three hundred ten thousand, twenty-one".