20021100100231 has 2 divisors, whose sum is σ = 20021100100232. Its totient is φ = 20021100100230.

The previous prime is 20021100100229. The next prime is 20021100100307. The reversal of 20021100100231 is 13200100112002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021100100231 - 2¹ = 20021100100229 is a prime.

It is a super-2 number, since 2×20021100100231² (a number of 27 digits) contains 22 as substring.

Together with 20021100100229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021100100031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550050115 + 10010550050116.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550050116).

Almost surely, 2^{20021100100231} is an apocalyptic number.

20021100100231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021100100231 is an equidigital number, since it uses as much as digits as its factorization.

20021100100231 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 20021100100231 its reverse (13200100112002), we get a palindrome (33221200212233).

The spelling of 20021100100231 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred thousand, two hundred thirty-one".