21001110200122 has 8 divisors (see below), whose sum is σ = 33924870323316. Its totient is φ = 9692820092352.

The previous prime is 21001110200117. The next prime is 21001110200137. The reversal of 21001110200122 is 22100201110012.

It can be written as a sum of positive squares in 2 ways, for example, as 20887742636721 + 113367563401 = 4570311^2 + 336701^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 403867503823 + ... + 403867503874.

Almost surely, 2^{21001110200122} is an apocalyptic number.

21001110200122 is a deficient number, since it is larger than the sum of its proper divisors (12923760123194).

21001110200122 is a wasteful number, since it uses less digits than its factorization.

21001110200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807735007712.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001110200122 its reverse (22100201110012), we get a palindrome (43101311310134).

The spelling of 21001110200122 in words is "twenty-one trillion, one billion, one hundred ten million, two hundred thousand, one hundred twenty-two".