2021629 has 2 divisors, whose sum is σ = 2021630. Its totient is φ = 2021628.

The previous prime is 2021627. The next prime is 2021639. The reversal of 2021629 is 9261202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 158404 = 1365^2 + 398^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021629 - 2¹ = 2021627 is a prime.

Together with 2021627, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010814 + 1010815.

It is an arithmetic number, because the mean of its divisors is an integer number (1010815).

2^2021629 is an apocalyptic number.

It is an amenable number.

2021629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021629 is an equidigital number, since it uses as much as digits as its factorization.

2021629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2021629 is about 1421.8400050639. The cubic root of 2021629 is about 126.4446580504. Note that the first 3 decimals are identical.

The spelling of 2021629 in words is "two million, twenty-one thousand, six hundred twenty-nine".