21733542 has 32 divisors (see below), whose sum is σ = 49858560. Its totient is φ = 7010280.

The previous prime is 21733513. The next prime is 21733561. The reversal of 21733542 is 24533712.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4818 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (1558080).

Almost surely, 2^21733542 is an apocalyptic number.

21733542 is an abundant number, since it is smaller than the sum of its proper divisors (28125018).

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

21733542 is a wasteful number, since it uses less digits than its factorization.

21733542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13025 (or 13019 counting only the distinct ones).

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

The square root of 21733542 is about 4661.9247098168. The cubic root of 21733542 is about 279.0680837427.

The spelling of 21733542 in words is "twenty-one million, seven hundred thirty-three thousand, five hundred forty-two".