2121929 has 4 divisors (see below), whose sum is σ = 2126976. Its totient is φ = 2116884.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121929 is 9291212.

It is a happy number.

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 2121929 - 2¹² = 2117833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121898 and 2121907.

It is not an unprimeable number, because it can be changed into a prime (2121979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829 + ... + 2754.

It is an arithmetic number, because the mean of its divisors is an integer number (531744).

2^2121929 is an apocalyptic number.

It is an amenable number.

2121929 is a deficient number, since it is larger than the sum of its proper divisors (5047).

2121929 is an equidigital number, since it uses as much as digits as its factorization.

2121929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046.

The product of its digits is 648, while the sum is 26.

The square root of 2121929 is about 1456.6842485590. The cubic root of 2121929 is about 128.5021170802.

The spelling of 2121929 in words is "two million, one hundred twenty-one thousand, nine hundred twenty-nine".