21163629 has 4 divisors (see below), whose sum is σ = 28218176. Its totient is φ = 14109084.

The previous prime is 21163627. The next prime is 21163643. The reversal of 21163629 is 92636112.

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 21163629 - 2¹ = 21163627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21163596 and 21163605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163621) 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, 3527269 + ... + 3527274.

It is an arithmetic number, because the mean of its divisors is an integer number (7054544).

Almost surely, 2^21163629 is an apocalyptic number.

It is an amenable number.

21163629 is a deficient number, since it is larger than the sum of its proper divisors (7054547).

21163629 is an equidigital number, since it uses as much as digits as its factorization.

21163629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054546.

The product of its digits is 3888, while the sum is 30.

The square root of 21163629 is about 4600.3944396106. The cubic root of 21163629 is about 276.6071359473.

The spelling of 21163629 in words is "twenty-one million, one hundred sixty-three thousand, six hundred twenty-nine".