21429796 has 12 divisors (see below), whose sum is σ = 39476080. Its totient is φ = 10150920.

The previous prime is 21429763. The next prime is 21429799. The reversal of 21429796 is 69792412.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21429799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140910 + ... + 141061.

Almost surely, 2^21429796 is an apocalyptic number.

It is an amenable number.

21429796 is a deficient number, since it is larger than the sum of its proper divisors (18046284).

21429796 is a wasteful number, since it uses less digits than its factorization.

21429796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281994 (or 281992 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 21429796 is about 4629.2327658047. The cubic root of 21429796 is about 277.7619029980.

The spelling of 21429796 in words is "twenty-one million, four hundred twenty-nine thousand, seven hundred ninety-six".