21101001012222 has 16 divisors (see below), whose sum is σ = 42203859207552. Its totient is φ = 7033357473560.

The previous prime is 21101001012167. The next prime is 21101001012229. The reversal of 21101001012222 is 22221010010112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101001012229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77234904 + ... + 77507627.

It is an arithmetic number, because the mean of its divisors is an integer number (2637741200472).

Almost surely, 2^{21101001012222} is an apocalyptic number.

21101001012222 is an abundant number, since it is smaller than the sum of its proper divisors (21102858195330).

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

21101001012222 is a wasteful number, since it uses less digits than its factorization.

21101001012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154765263.

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

Adding to 21101001012222 its reverse (22221010010112), we get a palindrome (43322011022334).

The spelling of 21101001012222 in words is "twenty-one trillion, one hundred one billion, one million, twelve thousand, two hundred twenty-two".