2121579 has 8 divisors (see below), whose sum is σ = 3143120. Its totient is φ = 1414368.

The previous prime is 2121569. The next prime is 2121601. The reversal of 2121579 is 9751212.

It is not a de Polignac number, because 2121579 - 2⁸ = 2121323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78577 = 2121579 / (2 + 1 + 2 + 1 + 5 + 7 + 9).

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121529) 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, 39262 + ... + 39315.

It is an arithmetic number, because the mean of its divisors is an integer number (392890).

2^2121579 is an apocalyptic number.

2121579 is a deficient number, since it is larger than the sum of its proper divisors (1021541).

2121579 is an equidigital number, since it uses as much as digits as its factorization.

2121579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78586 (or 78580 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2121579 is about 1456.5641077550. The cubic root of 2121579 is about 128.4950514630.

The spelling of 2121579 in words is "two million, one hundred twenty-one thousand, five hundred seventy-nine".