21012002020131 has 8 divisors (see below), whose sum is σ = 28170787239504. Its totient is φ = 13930609073760.

The previous prime is 21012002020123. The next prime is 21012002020147. The reversal of 21012002020131 is 13102020021012.

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

It is not a de Polignac number, because 21012002020131 - 2³ = 21012002020123 is a prime.

It is a super-2 number, since 2×21012002020131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012002020131.

It is not an unprimeable number, because it can be changed into a prime (21012002020931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19348067616 + ... + 19348068701.

It is an arithmetic number, because the mean of its divisors is an integer number (3521348404938).

Almost surely, 2^{21012002020131} is an apocalyptic number.

21012002020131 is a deficient number, since it is larger than the sum of its proper divisors (7158785219373).

21012002020131 is a wasteful number, since it uses less digits than its factorization.

21012002020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38696136501.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21012002020131 its reverse (13102020021012), we get a palindrome (34114022041143).

The spelling of 21012002020131 in words is "twenty-one trillion, twelve billion, two million, twenty thousand, one hundred thirty-one".