2129621 has 8 divisors (see below), whose sum is σ = 2316384. Its totient is φ = 1946160.

The previous prime is 2129599. The next prime is 2129627. The reversal of 2129621 is 1269212.

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

It is a cyclic number.

It is not a de Polignac number, because 2129621 - 2¹⁸ = 1867477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129627) 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, 626 + ... + 2156.

It is an arithmetic number, because the mean of its divisors is an integer number (289548).

2^2129621 is an apocalyptic number.

It is an amenable number.

2129621 is a deficient number, since it is larger than the sum of its proper divisors (186763).

2129621 is a wasteful number, since it uses less digits than its factorization.

2129621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its digits is 432, while the sum is 23.

The square root of 2129621 is about 1459.3221028957. The cubic root of 2129621 is about 128.6572033751.

The spelling of 2129621 in words is "two million, one hundred twenty-nine thousand, six hundred twenty-one".