21202311122021 has 8 divisors (see below), whose sum is σ = 21224259101664. Its totient is φ = 21180374054320.

The previous prime is 21202311121969. The next prime is 21202311122093. The reversal of 21202311122021 is 12022111320212.

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

It is a cyclic number.

It is not a de Polignac number, because 21202311122021 - 2²⁶ = 21202244013157 is a prime.

It is a super-2 number, since 2×21202311122021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202311121984 and 21202311122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202311022021) 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, 1162970 + ... + 6614916.

It is an arithmetic number, because the mean of its divisors is an integer number (2653032387708).

Almost surely, 2^{21202311122021} is an apocalyptic number.

It is an amenable number.

21202311122021 is a deficient number, since it is larger than the sum of its proper divisors (21947979643).

21202311122021 is a wasteful number, since it uses less digits than its factorization.

21202311122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455971.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21202311122021 its reverse (12022111320212), we get a palindrome (33224422442233).

The spelling of 21202311122021 in words is "twenty-one trillion, two hundred two billion, three hundred eleven million, one hundred twenty-two thousand, twenty-one".