2129901 has 4 divisors (see below), whose sum is σ = 2839872. Its totient is φ = 1419932.

The previous prime is 2129891. The next prime is 2129903. The reversal of 2129901 is 1099212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2129901 - 2⁶ = 2129837 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354981 + ... + 354986.

It is an arithmetic number, because the mean of its divisors is an integer number (709968).

2^2129901 is an apocalyptic number.

It is an amenable number.

2129901 is a deficient number, since it is larger than the sum of its proper divisors (709971).

2129901 is an equidigital number, since it uses as much as digits as its factorization.

2129901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709970.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 2129901 is about 1459.4180346974. The cubic root of 2129901 is about 128.6628416926.

The spelling of 2129901 in words is "two million, one hundred twenty-nine thousand, nine hundred one".