21964017 has 16 divisors (see below), whose sum is σ = 31154112. Its totient is φ = 13716480.

The previous prime is 21964003. The next prime is 21964031. The reversal of 21964017 is 71046912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21964003) and next prime (21964031).

It is not a de Polignac number, because 21964017 - 2¹² = 21959921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21964037) 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 15 ways as a sum of consecutive naturals, for example, 11398 + ... + 13184.

It is an arithmetic number, because the mean of its divisors is an integer number (1947132).

Almost surely, 2^21964017 is an apocalyptic number.

It is an amenable number.

21964017 is a deficient number, since it is larger than the sum of its proper divisors (9190095).

21964017 is a wasteful number, since it uses less digits than its factorization.

21964017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21964017 is about 4686.5783894009. The cubic root of 21964017 is about 280.0510833668.

The spelling of 21964017 in words is "twenty-one million, nine hundred sixty-four thousand, seventeen".