21199742 has 8 divisors (see below), whose sum is σ = 32659176. Its totient is φ = 10313352.

The previous prime is 21199741. The next prime is 21199751. The reversal of 21199742 is 24799112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143168 + ... + 143315.

It is an arithmetic number, because the mean of its divisors is an integer number (4082397).

Almost surely, 2^21199742 is an apocalyptic number.

21199742 is a deficient number, since it is larger than the sum of its proper divisors (11459434).

21199742 is a wasteful number, since it uses less digits than its factorization.

21199742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286522.

The product of its digits is 9072, while the sum is 35.

The square root of 21199742 is about 4604.3177561936. The cubic root of 21199742 is about 276.7643779964.

The spelling of 21199742 in words is "twenty-one million, one hundred ninety-nine thousand, seven hundred forty-two".