16221542 has 8 divisors (see below), whose sum is σ = 24356376. Its totient is φ = 8102752.

The previous prime is 16221529. The next prime is 16221563. The reversal of 16221542 is 24512261.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043 + ... + 5790.

It is an arithmetic number, because the mean of its divisors is an integer number (3044547).

Almost surely, 2^16221542 is an apocalyptic number.

16221542 is a deficient number, since it is larger than the sum of its proper divisors (8134834).

16221542 is a wasteful number, since it uses less digits than its factorization.

16221542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022.

The product of its digits is 960, while the sum is 23.

The square root of 16221542 is about 4027.5975469255. The cubic root of 16221542 is about 253.1419056331.

The spelling of 16221542 in words is "sixteen million, two hundred twenty-one thousand, five hundred forty-two".