21320201123021 has 4 divisors (see below), whose sum is σ = 21519455339232. Its totient is φ = 21120946906812.

The previous prime is 21320201122993. The next prime is 21320201123041. The reversal of 21320201123021 is 12032110202312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21320201123021 - 2¹⁰ = 21320201121997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320201122984 and 21320201123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320201123041) 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, 99627107945 + ... + 99627108158.

It is an arithmetic number, because the mean of its divisors is an integer number (5379863834808).

Almost surely, 2^{21320201123021} is an apocalyptic number.

It is an amenable number.

21320201123021 is a deficient number, since it is larger than the sum of its proper divisors (199254216211).

21320201123021 is a wasteful number, since it uses less digits than its factorization.

21320201123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199254216210.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21320201123021 its reverse (12032110202312), we get a palindrome (33352311325333).

The spelling of 21320201123021 in words is "twenty-one trillion, three hundred twenty billion, two hundred one million, one hundred twenty-three thousand, twenty-one".