21037629 has 4 divisors (see below), whose sum is σ = 28050176. Its totient is φ = 14025084.

The previous prime is 21037609. The next prime is 21037631. The reversal of 21037629 is 92673012.

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 not a de Polignac number, because 21037629 - 2⁹ = 21037117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21037596 and 21037605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037609) 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, 3506269 + ... + 3506274.

It is an arithmetic number, because the mean of its divisors is an integer number (7012544).

Almost surely, 2^21037629 is an apocalyptic number.

It is an amenable number.

21037629 is a deficient number, since it is larger than the sum of its proper divisors (7012547).

21037629 is an equidigital number, since it uses as much as digits as its factorization.

21037629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012546.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21037629 is about 4586.6795179084. The cubic root of 21037629 is about 276.0571059110.

The spelling of 21037629 in words is "twenty-one million, thirty-seven thousand, six hundred twenty-nine".