21429892 has 24 divisors (see below), whose sum is σ = 41080032. Its totient is φ = 9700800.

The previous prime is 21429887. The next prime is 21429893. The reversal of 21429892 is 29892412.

It is a super-2 number, since 2×21429892² = 918480542263328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21429893) 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 7 ways as a sum of consecutive naturals, for example, 11592 + ... + 13312.

It is an arithmetic number, because the mean of its divisors is an integer number (1711668).

Almost surely, 2^21429892 is an apocalyptic number.

21429892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21429892 is a deficient number, since it is larger than the sum of its proper divisors (19650140).

21429892 is a wasteful number, since it uses less digits than its factorization.

21429892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019 (or 2017 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 21429892 is about 4629.2431346820. The cubic root of 21429892 is about 277.7623177648.

The spelling of 21429892 in words is "twenty-one million, four hundred twenty-nine thousand, eight hundred ninety-two".