21693146 has 8 divisors (see below), whose sum is σ = 32588244. Its totient is φ = 10830400.

The previous prime is 21693143. The next prime is 21693151. The reversal of 21693146 is 64139612.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 579121 = 4595^2 + 761^2 .

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

It is a super-4 number, since 4×21693146⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21693143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6335 + ... + 9138.

Almost surely, 2^21693146 is an apocalyptic number.

21693146 is a deficient number, since it is larger than the sum of its proper divisors (10895098).

21693146 is a wasteful number, since it uses less digits than its factorization.

21693146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16176.

The product of its digits is 7776, while the sum is 32.

The square root of 21693146 is about 4657.5901494228. The cubic root of 21693146 is about 278.8950758022.

The spelling of 21693146 in words is "twenty-one million, six hundred ninety-three thousand, one hundred forty-six".