21629073 has 8 divisors (see below), whose sum is σ = 29119168. Its totient is φ = 14279184.

The previous prime is 21629063. The next prime is 21629119. The reversal of 21629073 is 37092612.

21629073 is nontrivially palindromic in base 8.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21629073 - 2⁴ = 21629057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21629073.

It is not an unprimeable number, because it can be changed into a prime (21629063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34690 + ... + 35307.

It is an arithmetic number, because the mean of its divisors is an integer number (3639896).

Almost surely, 2^21629073 is an apocalyptic number.

It is an amenable number.

21629073 is a deficient number, since it is larger than the sum of its proper divisors (7490095).

21629073 is a wasteful number, since it uses less digits than its factorization.

21629073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70103.

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

The square root of 21629073 is about 4650.7067204888. The cubic root of 21629073 is about 278.6202229921.

The spelling of 21629073 in words is "twenty-one million, six hundred twenty-nine thousand, seventy-three".