2125521 has 12 divisors (see below), whose sum is σ = 3184272. Its totient is φ = 1416852.

The previous prime is 2125517. The next prime is 2125523. The reversal of 2125521 is 1255212.

It is not a de Polignac number, because 2125521 - 2² = 2125517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2125494 and 2125503.

It is not an unprimeable number, because it can be changed into a prime (2125523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4131 + ... + 4616.

It is an arithmetic number, because the mean of its divisors is an integer number (265356).

2^2125521 is an apocalyptic number.

It is an amenable number.

2125521 is a deficient number, since it is larger than the sum of its proper divisors (1058751).

2125521 is an frugal number, since it uses more digits than its factorization.

2125521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8762 (or 8750 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2125521 is about 1457.9166642850. The cubic root of 2125521 is about 128.5745856368.

Multiplying 2125521 by its sum of digits (18), we get a triangular number (38259378 = T₈₇₄₇).

The spelling of 2125521 in words is "two million, one hundred twenty-five thousand, five hundred twenty-one".