2121629 has 4 divisors (see below), whose sum is σ = 2125884. Its totient is φ = 2117376.

The previous prime is 2121619. The next prime is 2121631. The reversal of 2121629 is 9261212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1965604 + 156025 = 1402^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121629 - 2⁸ = 2121373 is a prime.

It is a super-2 number, since 2×2121629² = 9002619227282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121619) 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, 1262 + ... + 2415.

It is an arithmetic number, because the mean of its divisors is an integer number (531471).

2^2121629 is an apocalyptic number.

It is an amenable number.

2121629 is a deficient number, since it is larger than the sum of its proper divisors (4255).

2121629 is an equidigital number, since it uses as much as digits as its factorization.

2121629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254.

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

The square root of 2121629 is about 1456.5812713337. The cubic root of 2121629 is about 128.4960608845.

The spelling of 2121629 in words is "two million, one hundred twenty-one thousand, six hundred twenty-nine".