2139621 has 16 divisors (see below), whose sum is σ = 3248640. Its totient is φ = 1239920.

The previous prime is 2139611. The next prime is 2139653. The reversal of 2139621 is 1269312.

It is not a de Polignac number, because 2139621 - 2⁷ = 2139493 is a prime.

2139621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2139591 and 2139600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139611) 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, 651 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (203040).

2^2139621 is an apocalyptic number.

It is an amenable number.

2139621 is a deficient number, since it is larger than the sum of its proper divisors (1109019).

2139621 is a wasteful number, since it uses less digits than its factorization.

2139621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856.

The product of its digits is 648, while the sum is 24.

The square root of 2139621 is about 1462.7443385636. The cubic root of 2139621 is about 128.8582663025.

The spelling of 2139621 in words is "two million, one hundred thirty-nine thousand, six hundred twenty-one".