21000220010122 has 8 divisors (see below), whose sum is σ = 31931841385476. Its totient is φ = 10356272881632.

The previous prime is 21000220010101. The next prime is 21000220010167. The reversal of 21000220010122 is 22101002200012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20915795477641 + 84424532481 = 4573379^2 + 290559^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71918561533 + ... + 71918561824.

Almost surely, 2^{21000220010122} is an apocalyptic number.

21000220010122 is a deficient number, since it is larger than the sum of its proper divisors (10931621375354).

21000220010122 is a wasteful number, since it uses less digits than its factorization.

21000220010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143837123432.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000220010122 its reverse (22101002200012), we get a palindrome (43101222210134).

The spelling of 21000220010122 in words is "twenty-one trillion, two hundred twenty million, ten thousand, one hundred twenty-two".