21000111202122 has 32 divisors (see below), whose sum is σ = 47611588153920. Its totient is φ = 6121489904640.

The previous prime is 21000111202069. The next prime is 21000111202123. The reversal of 21000111202122 is 22120211100012.

It is not an unprimeable number, because it can be changed into a prime (21000111202123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7085056279 + ... + 7085059242.

It is an arithmetic number, because the mean of its divisors is an integer number (1487862129810).

Almost surely, 2^{21000111202122} is an apocalyptic number.

21000111202122 is an abundant number, since it is smaller than the sum of its proper divisors (26611476951798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000111202122 is a wasteful number, since it uses less digits than its factorization.

21000111202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170115558.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21000111202122 its reverse (22120211100012), we get a palindrome (43120322302134).

The spelling of 21000111202122 in words is "twenty-one trillion, one hundred eleven million, two hundred two thousand, one hundred twenty-two".