21064364122 has 4 divisors (see below), whose sum is σ = 31596546186. Its totient is φ = 10532182060.

The previous prime is 21064364081. The next prime is 21064364147. The reversal of 21064364122 is 22146346012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21002096241 + 62267881 = 144921^2 + 7891^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5266091029 + ... + 5266091032.

Almost surely, 2^21064364122 is an apocalyptic number.

21064364122 is a deficient number, since it is larger than the sum of its proper divisors (10532182064).

21064364122 is a wasteful number, since it uses less digits than its factorization.

21064364122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532182063.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 21064364122 in words is "twenty-one billion, sixty-four million, three hundred sixty-four thousand, one hundred twenty-two".