21164354 has 8 divisors (see below), whose sum is σ = 33614028. Its totient is φ = 9959680.

The previous prime is 21164327. The next prime is 21164357. The reversal of 21164354 is 45346112.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 142129 = 4585^2 + 377^2 .

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 (21164357) 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, 311207 + ... + 311274.

Almost surely, 2^21164354 is an apocalyptic number.

21164354 is a deficient number, since it is larger than the sum of its proper divisors (12449674).

21164354 is a wasteful number, since it uses less digits than its factorization.

21164354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622500.

The product of its digits is 2880, while the sum is 26.

The square root of 21164354 is about 4600.4732365269. The cubic root of 21164354 is about 276.6102944775.

The spelling of 21164354 in words is "twenty-one million, one hundred sixty-four thousand, three hundred fifty-four".