21937546 has 4 divisors (see below), whose sum is σ = 32906322. Its totient is φ = 10968772.

The previous prime is 21937541. The next prime is 21937547. The reversal of 21937546 is 64573912.

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

It can be written as a sum of positive squares in only one way, i.e., 19456921 + 2480625 = 4411^2 + 1575^2 .

It is not an unprimeable number, because it can be changed into a prime (21937541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5484385 + ... + 5484388.

Almost surely, 2^21937546 is an apocalyptic number.

21937546 is a deficient number, since it is larger than the sum of its proper divisors (10968776).

21937546 is a wasteful number, since it uses less digits than its factorization.

21937546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10968775.

The product of its digits is 45360, while the sum is 37.

The square root of 21937546 is about 4683.7534093929. The cubic root of 21937546 is about 279.9385324256.

The spelling of 21937546 in words is "twenty-one million, nine hundred thirty-seven thousand, five hundred forty-six".