21415429 has 12 divisors (see below), whose sum is σ = 24805984. Its totient is φ = 18110304.

The previous prime is 21415423. The next prime is 21415439. The reversal of 21415429 is 92451412.

It is not a de Polignac number, because 21415429 - 2¹⁵ = 21382661 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21415397 and 21415406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415423) 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, 131302 + ... + 131464.

Almost surely, 2^21415429 is an apocalyptic number.

It is an amenable number.

21415429 is a deficient number, since it is larger than the sum of its proper divisors (3390555).

21415429 is an equidigital number, since it uses as much as digits as its factorization.

21415429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 307 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 21415429 is about 4627.6807366109. The cubic root of 21415429 is about 277.6998165866.

The spelling of 21415429 in words is "twenty-one million, four hundred fifteen thousand, four hundred twenty-nine".