21425733 has 24 divisors (see below), whose sum is σ = 35568000. Its totient is φ = 12174624.

The previous prime is 21425707. The next prime is 21425759. The reversal of 21425733 is 33752412.

21425733 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (21425707) and next prime (21425759).

It is not a de Polignac number, because 21425733 - 2⁸ = 21425477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21425697 and 21425706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425773) 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 23 ways as a sum of consecutive naturals, for example, 11683 + ... + 13391.

It is an arithmetic number, because the mean of its divisors is an integer number (1482000).

Almost surely, 2^21425733 is an apocalyptic number.

It is an amenable number.

21425733 is a deficient number, since it is larger than the sum of its proper divisors (14142267).

21425733 is a wasteful number, since it uses less digits than its factorization.

21425733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921 (or 1918 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21425733 is about 4628.7939033835. The cubic root of 21425733 is about 277.7443477221.

It can be divided in two parts, 2142 and 5733, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 21425733 in words is "twenty-one million, four hundred twenty-five thousand, seven hundred thirty-three".