21712354 has 8 divisors (see below), whose sum is σ = 33120720. Its totient is φ = 10672116.

The previous prime is 21712343. The next prime is 21712357. The reversal of 21712354 is 45321712.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21712357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91884 + ... + 92119.

It is an arithmetic number, because the mean of its divisors is an integer number (4140090).

Almost surely, 2^21712354 is an apocalyptic number.

21712354 is a deficient number, since it is larger than the sum of its proper divisors (11408366).

21712354 is a wasteful number, since it uses less digits than its factorization.

21712354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184064.

The product of its digits is 1680, while the sum is 25.

The square root of 21712354 is about 4659.6517037221. The cubic root of 21712354 is about 278.9773665602.

The spelling of 21712354 in words is "twenty-one million, seven hundred twelve thousand, three hundred fifty-four".