21346394 has 8 divisors (see below), whose sum is σ = 32039220. Its totient is φ = 10666656.

The previous prime is 21346387. The next prime is 21346397. The reversal of 21346394 is 49364312.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 1428025 = 4463^2 + 1195^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21346394.

It is not an unprimeable number, because it can be changed into a prime (21346397) 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, 4502 + ... + 7934.

Almost surely, 2^21346394 is an apocalyptic number.

21346394 is a deficient number, since it is larger than the sum of its proper divisors (10692826).

21346394 is a wasteful number, since it uses less digits than its factorization.

21346394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544.

The product of its digits is 15552, while the sum is 32.

The square root of 21346394 is about 4620.2157958260. The cubic root of 21346394 is about 277.4010966970.

The spelling of 21346394 in words is "twenty-one million, three hundred forty-six thousand, three hundred ninety-four".