21201101110122 has 64 divisors (see below), whose sum is σ = 44091817136640. Its totient is φ = 6790270906944.

The previous prime is 21201101110099. The next prime is 21201101110127. The reversal of 21201101110122 is 22101110110212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21201101110127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42852453 + ... + 43344375.

It is an arithmetic number, because the mean of its divisors is an integer number (688934642760).

Almost surely, 2^{21201101110122} is an apocalyptic number.

21201101110122 is an abundant number, since it is smaller than the sum of its proper divisors (22890716026518).

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

21201101110122 is a wasteful number, since it uses less digits than its factorization.

21201101110122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494387.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201101110122 its reverse (22101110110212), we get a palindrome (43302211220334).

The spelling of 21201101110122 in words is "twenty-one trillion, two hundred one billion, one hundred one million, one hundred ten thousand, one hundred twenty-two".