20021131110031 has 8 divisors (see below), whose sum is σ = 20030766234624. Its totient is φ = 20011498244640.

The previous prime is 20021131110011. The next prime is 20021131110041. The reversal of 20021131110031 is 13001113112002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021131110031 is a prime.

It is a super-2 number, since 2×20021131110031² (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 = 20021131109987 and 20021131110014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021131110011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17299186 + ... + 18420208.

It is an arithmetic number, because the mean of its divisors is an integer number (2503845779328).

Almost surely, 2^{20021131110031} is an apocalyptic number.

20021131110031 is a deficient number, since it is larger than the sum of its proper divisors (9635124593).

20021131110031 is a wasteful number, since it uses less digits than its factorization.

20021131110031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129601.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20021131110031 its reverse (13001113112002), we get a palindrome (33022244222033).

The spelling of 20021131110031 in words is "twenty trillion, twenty-one billion, one hundred thirty-one million, one hundred ten thousand, thirty-one".