20021102023431 has 4 divisors (see below), whose sum is σ = 26694802697912. Its totient is φ = 13347401348952.

The previous prime is 20021102023331. The next prime is 20021102023451. The reversal of 20021102023431 is 13432020112002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20021102023431 - 2⁹ = 20021102022919 is a prime.

It is a super-2 number, since 2×20021102023431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021102023398 and 20021102023407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021102023451) 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, 3336850337236 + ... + 3336850337241.

It is an arithmetic number, because the mean of its divisors is an integer number (6673700674478).

Almost surely, 2^{20021102023431} is an apocalyptic number.

20021102023431 is a deficient number, since it is larger than the sum of its proper divisors (6673700674481).

20021102023431 is an equidigital number, since it uses as much as digits as its factorization.

20021102023431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673700674480.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20021102023431 its reverse (13432020112002), we get a palindrome (33453122135433).

The spelling of 20021102023431 in words is "twenty trillion, twenty-one billion, one hundred two million, twenty-three thousand, four hundred thirty-one".