21429099 has 6 divisors (see below), whose sum is σ = 30953156. Its totient is φ = 14286060.

The previous prime is 21429097. The next prime is 21429103. The reversal of 21429099 is 99092412.

It is not a de Polignac number, because 21429099 - 2¹ = 21429097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21429097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190497 + ... + 1190514.

Almost surely, 2^21429099 is an apocalyptic number.

21429099 is a deficient number, since it is larger than the sum of its proper divisors (9524057).

21429099 is a wasteful number, since it uses less digits than its factorization.

21429099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381017 (or 2381014 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 21429099 is about 4629.1574827392. The cubic root of 21429099 is about 277.7588915811.

The spelling of 21429099 in words is "twenty-one million, four hundred twenty-nine thousand, ninety-nine".