20211231004002 has 24 divisors (see below), whose sum is σ = 45301035010140. Its totient is φ = 6504764001120.

The previous prime is 20211231003961. The next prime is 20211231004007. The reversal of 20211231004002 is 20040013211202.

It is a happy number.

20211231004002 is a `hidden beast` number, since 20 + 2 + 11 + 231 + 0 + 0 + 400 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19104146147241 + 1107084856761 = 4370829^2 + 1052181^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20211231004007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19359416149 + ... + 19359417192.

Almost surely, 2^{20211231004002} is an apocalyptic number.

20211231004002 is an abundant number, since it is smaller than the sum of its proper divisors (25089804006138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20211231004002 is a wasteful number, since it uses less digits than its factorization.

20211231004002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38718833378 (or 38718833375 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20211231004002 its reverse (20040013211202), we get a palindrome (40251244215204).

The spelling of 20211231004002 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-one million, four thousand, two".