2121639 has 8 divisors (see below), whose sum is σ = 3046512. Its totient is φ = 1305600.

The previous prime is 2121631. The next prime is 2121653. The reversal of 2121639 is 9361212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121639 - 2³ = 2121631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27162 + ... + 27239.

It is an arithmetic number, because the mean of its divisors is an integer number (380814).

2^2121639 is an apocalyptic number.

2121639 is a deficient number, since it is larger than the sum of its proper divisors (924873).

2121639 is a wasteful number, since it uses less digits than its factorization.

2121639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54417.

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

The square root of 2121639 is about 1456.5847040251. The cubic root of 2121639 is about 128.4962627669.

The spelling of 2121639 in words is "two million, one hundred twenty-one thousand, six hundred thirty-nine".