2521971 has 6 divisors (see below), whose sum is σ = 3642860. Its totient is φ = 1681308.

The previous prime is 2521969. The next prime is 2521979. The reversal of 2521971 is 1791252.

It is not a de Polignac number, because 2521971 - 2¹ = 2521969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140101 + ... + 140118.

2^2521971 is an apocalyptic number.

2521971 is a deficient number, since it is larger than the sum of its proper divisors (1120889).

2521971 is a wasteful number, since it uses less digits than its factorization.

2521971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280225 (or 280222 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2521971 is about 1588.0714719432. The cubic root of 2521971 is about 136.1173115537.

The spelling of 2521971 in words is "two million, five hundred twenty-one thousand, nine hundred seventy-one".