21112021200122 has 4 divisors (see below), whose sum is σ = 31668031800186. Its totient is φ = 10556010600060.

The previous prime is 21112021200121. The next prime is 21112021200157. The reversal of 21112021200122 is 22100212021112.

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., 19672959447241 + 1439061752881 = 4435421^2 + 1199609^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112021200122.

It is not an unprimeable number, because it can be changed into a prime (21112021200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278005300029 + ... + 5278005300032.

Almost surely, 2^{21112021200122} is an apocalyptic number.

21112021200122 is a deficient number, since it is larger than the sum of its proper divisors (10556010600064).

21112021200122 is a wasteful number, since it uses less digits than its factorization.

21112021200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556010600063.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112021200122 its reverse (22100212021112), we get a palindrome (43212233221234).

The spelling of 21112021200122 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, two hundred thousand, one hundred twenty-two".