2521138 has 4 divisors (see below), whose sum is σ = 3781710. Its totient is φ = 1260568.

The previous prime is 2521111. The next prime is 2521147. The reversal of 2521138 is 8311252.

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

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 915849 = 1267^2 + 957^2 .

It is a super-2 number, since 2×2521138² = 12712273630088, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630283 + ... + 630286.

2^2521138 is an apocalyptic number.

2521138 is a deficient number, since it is larger than the sum of its proper divisors (1260572).

2521138 is a wasteful number, since it uses less digits than its factorization.

2521138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260571.

The product of its digits is 480, while the sum is 22.

The square root of 2521138 is about 1587.8091824901. The cubic root of 2521138 is about 136.1023235137.

The spelling of 2521138 in words is "two million, five hundred twenty-one thousand, one hundred thirty-eight".