20021115011231 has 2 divisors, whose sum is σ = 20021115011232. Its totient is φ = 20021115011230.

The previous prime is 20021115011153. The next prime is 20021115011263. The reversal of 20021115011231 is 13211051112002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021115011231 - 2¹⁰ = 20021115010207 is a prime.

It is a super-2 number, since 2×20021115011231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021115011731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010557505615 + 10010557505616.

It is an arithmetic number, because the mean of its divisors is an integer number (10010557505616).

Almost surely, 2^{20021115011231} is an apocalyptic number.

20021115011231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021115011231 is an equidigital number, since it uses as much as digits as its factorization.

20021115011231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 20021115011231 its reverse (13211051112002), we get a palindrome (33232166123233).

The spelling of 20021115011231 in words is "twenty trillion, twenty-one billion, one hundred fifteen million, eleven thousand, two hundred thirty-one".