2131201010021 has 4 divisors (see below), whose sum is σ = 2131370582700. Its totient is φ = 2131031437344.

The previous prime is 2131201009997. The next prime is 2131201010051. The reversal of 2131201010021 is 1200101021312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2009320425025 + 121880584996 = 1417505^2 + 349114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131201010021 is a prime.

It is a super-2 number, since 2×2131201010021² (a number of 25 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 = 2131201009978 and 2131201010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131201010051) 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, 84767486 + ... + 84792623.

It is an arithmetic number, because the mean of its divisors is an integer number (532842645675).

Almost surely, 2^{2131201010021} is an apocalyptic number.

It is an amenable number.

2131201010021 is a deficient number, since it is larger than the sum of its proper divisors (169572679).

2131201010021 is a wasteful number, since it uses less digits than its factorization.

2131201010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169572678.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 2131201010021 its reverse (1200101021312), we get a palindrome (3331302031333).

The spelling of 2131201010021 in words is "two trillion, one hundred thirty-one billion, two hundred one million, ten thousand, twenty-one".