21325429 has 16 divisors (see below), whose sum is σ = 24036480. Its totient is φ = 18800640.

The previous prime is 21325397. The next prime is 21325433. The reversal of 21325429 is 92452312.

It is not a de Polignac number, because 21325429 - 2⁵ = 21325397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21325397 and 21325406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326429) 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 15 ways as a sum of consecutive naturals, for example, 32949 + ... + 33589.

It is an arithmetic number, because the mean of its divisors is an integer number (1502280).

Almost surely, 2^21325429 is an apocalyptic number.

It is an amenable number.

21325429 is a deficient number, since it is larger than the sum of its proper divisors (2711051).

21325429 is a wasteful number, since it uses less digits than its factorization.

21325429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 4320, while the sum is 28.

The square root of 21325429 is about 4617.9464050593. The cubic root of 21325429 is about 277.3102520174.

The spelling of 21325429 in words is "twenty-one million, three hundred twenty-five thousand, four hundred twenty-nine".