21916354 has 8 divisors (see below), whose sum is σ = 32897340. Its totient is φ = 10950576.

The previous prime is 21916343. The next prime is 21916357. The reversal of 21916354 is 45361912.

It can be written as a sum of positive squares in 2 ways, for example, as 21874329 + 42025 = 4677^2 + 205^2 .

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 (21916357) 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, 1032 + ... + 6700.

Almost surely, 2^21916354 is an apocalyptic number.

21916354 is a deficient number, since it is larger than the sum of its proper divisors (10980986).

21916354 is a wasteful number, since it uses less digits than its factorization.

21916354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604.

The product of its digits is 6480, while the sum is 31.

The square root of 21916354 is about 4681.4905745927. The cubic root of 21916354 is about 279.8483617704.

The spelling of 21916354 in words is "twenty-one million, nine hundred sixteen thousand, three hundred fifty-four".