21629099 has 8 divisors (see below), whose sum is σ = 22921920. Its totient is φ = 20372800.

The previous prime is 21629063. The next prime is 21629119. The reversal of 21629099 is 99092612.

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

It is a cyclic number.

It is not a de Polignac number, because 21629099 - 2²⁴ = 4851883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21629009) 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, 7907 + ... + 10284.

It is an arithmetic number, because the mean of its divisors is an integer number (2865240).

Almost surely, 2^21629099 is an apocalyptic number.

21629099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21629099 is a deficient number, since it is larger than the sum of its proper divisors (1292821).

21629099 is a wasteful number, since it uses less digits than its factorization.

21629099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18261.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 21629099 is about 4650.7095157621. The cubic root of 21629099 is about 278.6203346339.

The spelling of 21629099 in words is "twenty-one million, six hundred twenty-nine thousand, ninety-nine".