21020131202023 has 4 divisors (see below), whose sum is σ = 21020251186480. Its totient is φ = 21020011217568.

The previous prime is 21020131202009. The next prime is 21020131202117. The reversal of 21020131202023 is 32020213102012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020131202023 - 2²⁹ = 21019594331111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020131202123) 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, 59729058 + ... + 60079951.

It is an arithmetic number, because the mean of its divisors is an integer number (5255062796620).

Almost surely, 2^{21020131202023} is an apocalyptic number.

21020131202023 is a deficient number, since it is larger than the sum of its proper divisors (119984457).

21020131202023 is a wasteful number, since it uses less digits than its factorization.

21020131202023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119984456.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21020131202023 its reverse (32020213102012), we get a palindrome (53040344304035).

The spelling of 21020131202023 in words is "twenty-one trillion, twenty billion, one hundred thirty-one million, two hundred two thousand, twenty-three".