2157129 has 24 divisors (see below), whose sum is σ = 3407040. Its totient is φ = 1307232.

The previous prime is 2157121. The next prime is 2157131. The reversal of 2157129 is 9217512.

It is not a de Polignac number, because 2157129 - 2³ = 2157121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11962 + ... + 12140.

It is an arithmetic number, because the mean of its divisors is an integer number (141960).

2^2157129 is an apocalyptic number.

It is an amenable number.

2157129 is a deficient number, since it is larger than the sum of its proper divisors (1249911).

2157129 is a wasteful number, since it uses less digits than its factorization.

2157129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

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

The square root of 2157129 is about 1468.7167868585. The cubic root of 2157129 is about 129.2087839529.

The spelling of 2157129 in words is "two million, one hundred fifty-seven thousand, one hundred twenty-nine".