2131784973021 has 32 divisors (see below), whose sum is σ = 3148435058688. Its totient is φ = 1272192186240.

The previous prime is 2131784973001. The next prime is 2131784973047. The reversal of 2131784973021 is 1203794871312.

It is a de Polignac number, because none of the positive numbers 2^k-2131784973021 is a prime.

It is a super-3 number, since 3×2131784973021³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131784973001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733330 + ... + 2191196.

It is an arithmetic number, because the mean of its divisors is an integer number (98388595584).

Almost surely, 2^{2131784973021} is an apocalyptic number.

It is an amenable number.

2131784973021 is a deficient number, since it is larger than the sum of its proper divisors (1016650085667).

2131784973021 is a wasteful number, since it uses less digits than its factorization.

2131784973021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458561.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 2131784973021 in words is "two trillion, one hundred thirty-one billion, seven hundred eighty-four million, nine hundred seventy-three thousand, twenty-one".