21422929 has 12 divisors (see below), whose sum is σ = 24054912. Its totient is φ = 19055960.

The previous prime is 21422897. The next prime is 21422939. The reversal of 21422929 is 92922412.

It is not a de Polignac number, because 21422929 - 2⁵ = 21422897 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 21422929.

It is not an unprimeable number, because it can be changed into a prime (21422939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3804 + ... + 7570.

It is an arithmetic number, because the mean of its divisors is an integer number (2004576).

Almost surely, 2^21422929 is an apocalyptic number.

It is an amenable number.

21422929 is a deficient number, since it is larger than the sum of its proper divisors (2631983).

21422929 is a wasteful number, since it uses less digits than its factorization.

21422929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836 (or 3825 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21422929 is about 4628.4910067969. The cubic root of 21422929 is about 277.7322309974.

The spelling of 21422929 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred twenty-nine".