20412310021 has 2 divisors, whose sum is σ = 20412310022. Its totient is φ = 20412310020.

The previous prime is 20412310019. The next prime is 20412310031. The reversal of 20412310021 is 12001321402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19748680900 + 663629121 = 140530^2 + 25761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412310021 - 2¹ = 20412310019 is a prime.

Together with 20412310019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20412309977 and 20412310004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20412310031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206155010 + 10206155011.

It is an arithmetic number, because the mean of its divisors is an integer number (10206155011).

Almost surely, 2^20412310021 is an apocalyptic number.

It is an amenable number.

20412310021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412310021 is an equidigital number, since it uses as much as digits as its factorization.

20412310021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20412310021 its reverse (12001321402), we get a palindrome (32413631423).

The spelling of 20412310021 in words is "twenty billion, four hundred twelve million, three hundred ten thousand, twenty-one".