21429120 has 64 divisors (see below), whose sum is σ = 68311440. Its totient is φ = 5713920.

The previous prime is 21429113. The next prime is 21429127. The reversal of 21429120 is 2192412.

It is an interprime number because it is at equal distance from previous prime (21429113) and next prime (21429127).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429127) 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, 3661 + ... + 7500.

Almost surely, 2^21429120 is an apocalyptic number.

21429120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21429120 is an abundant number, since it is smaller than the sum of its proper divisors (46882320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21429120 is a wasteful number, since it uses less digits than its factorization.

21429120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183 (or 11171 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21429120 is about 4629.1597509699. The cubic root of 21429120 is about 277.7589823134.

The spelling of 21429120 in words is "twenty-one million, four hundred twenty-nine thousand, one hundred twenty".