16421722 has 8 divisors (see below), whose sum is σ = 24858900. Its totient is φ = 8135424.

The previous prime is 16421707. The next prime is 16421731. The reversal of 16421722 is 22712461.

It can be written as a sum of positive squares in 2 ways, for example, as 16152361 + 269361 = 4019^2 + 519^2 .

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

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, 37447 + ... + 37882.

Almost surely, 2^16421722 is an apocalyptic number.

16421722 is a deficient number, since it is larger than the sum of its proper divisors (8437178).

16421722 is a wasteful number, since it uses less digits than its factorization.

16421722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75440.

The product of its digits is 1344, while the sum is 25.

The square root of 16421722 is about 4052.3723915751. The cubic root of 16421722 is about 254.1789405999.

It can be divided in two parts, 1642 and 1722, that added together give a square (3364 = 58²).

The spelling of 16421722 in words is "sixteen million, four hundred twenty-one thousand, seven hundred twenty-two".