21202001100122 has 4 divisors (see below), whose sum is σ = 31803001650186. Its totient is φ = 10601000550060.

The previous prime is 21202001100097. The next prime is 21202001100127. The reversal of 21202001100122 is 22100110020212.

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., 18253324856881 + 2948676243241 = 4272391^2 + 1717171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21202001100097 and 21202001100106.

It is not an unprimeable number, because it can be changed into a prime (21202001100127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300500275029 + ... + 5300500275032.

Almost surely, 2^{21202001100122} is an apocalyptic number.

21202001100122 is a deficient number, since it is larger than the sum of its proper divisors (10601000550064).

21202001100122 is a wasteful number, since it uses less digits than its factorization.

21202001100122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601000550063.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202001100122 its reverse (22100110020212), we get a palindrome (43302111120334).

The spelling of 21202001100122 in words is "twenty-one trillion, two hundred two billion, one million, one hundred thousand, one hundred twenty-two".