2971887921 has 16 divisors (see below), whose sum is σ = 4485870720. Its totient is φ = 1943875440.

The previous prime is 2971887901. The next prime is 2971887931. The reversal of 2971887921 is 1297881792.

It is not a de Polignac number, because 2971887921 - 2⁶ = 2971887857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2971887901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1036965 + ... + 1039826.

It is an arithmetic number, because the mean of its divisors is an integer number (280366920).

Almost surely, 2^2971887921 is an apocalyptic number.

It is an amenable number.

2971887921 is a deficient number, since it is larger than the sum of its proper divisors (1513982799).

2971887921 is a wasteful number, since it uses less digits than its factorization.

2971887921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076853 (or 2076847 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 2971887921 is about 54515.0247271337. The cubic root of 2971887921 is about 1437.7304657432.

The spelling of 2971887921 in words is "two billion, nine hundred seventy-one million, eight hundred eighty-seven thousand, nine hundred twenty-one".