21937534 has 4 divisors (see below), whose sum is σ = 32906304. Its totient is φ = 10968766.

The previous prime is 21937529. The next prime is 21937541. The reversal of 21937534 is 43573912.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21937534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5484382 + ... + 5484385.

It is an arithmetic number, because the mean of its divisors is an integer number (8226576).

Almost surely, 2^21937534 is an apocalyptic number.

21937534 is a deficient number, since it is larger than the sum of its proper divisors (10968770).

21937534 is a wasteful number, since it uses less digits than its factorization.

21937534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968769.

The product of its digits is 22680, while the sum is 34.

The square root of 21937534 is about 4683.7521283689. The cubic root of 21937534 is about 279.9384813827.

The spelling of 21937534 in words is "twenty-one million, nine hundred thirty-seven thousand, five hundred thirty-four".