20102113021 has 2 divisors, whose sum is σ = 20102113022. Its totient is φ = 20102113020.

The previous prime is 20102113013. The next prime is 20102113067. The reversal of 20102113021 is 12031120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11150304025 + 8951808996 = 105595^2 + 94614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102113021 - 2³ = 20102113013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20102112992 and 20102113010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102113921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051056510 + 10051056511.

It is an arithmetic number, because the mean of its divisors is an integer number (10051056511).

Almost surely, 2^20102113021 is an apocalyptic number.

It is an amenable number.

20102113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102113021 is an equidigital number, since it uses as much as digits as its factorization.

20102113021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20102113021 its reverse (12031120102), we get a palindrome (32133233123).

The spelling of 20102113021 in words is "twenty billion, one hundred two million, one hundred thirteen thousand, twenty-one".