21031022203121 has 4 divisors (see below), whose sum is σ = 24035453946432. Its totient is φ = 18026590459812.

The previous prime is 21031022203073. The next prime is 21031022203127. The reversal of 21031022203121 is 12130222013012.

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 21031022203121 - 2¹⁰ = 21031022202097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031022203093 and 21031022203102.

It is not an unprimeable number, because it can be changed into a prime (21031022203127) 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, 1502215871645 + ... + 1502215871658.

It is an arithmetic number, because the mean of its divisors is an integer number (6008863486608).

Almost surely, 2^{21031022203121} is an apocalyptic number.

It is an amenable number.

21031022203121 is a deficient number, since it is larger than the sum of its proper divisors (3004431743311).

21031022203121 is an equidigital number, since it uses as much as digits as its factorization.

21031022203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004431743310.

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

Adding to 21031022203121 its reverse (12130222013012), we get a palindrome (33161244216133).

The spelling of 21031022203121 in words is "twenty-one trillion, thirty-one billion, twenty-two million, two hundred three thousand, one hundred twenty-one".