21100122222142 has 64 divisors (see below), whose sum is σ = 35914286352384. Its totient is φ = 9242639239680.

The previous prime is 21100122222139. The next prime is 21100122222149. The reversal of 21100122222142 is 24122222100112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100122222149) 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, 7954908 + ... + 10270384.

It is an arithmetic number, because the mean of its divisors is an integer number (561160724256).

Almost surely, 2^{21100122222142} is an apocalyptic number.

21100122222142 is a deficient number, since it is larger than the sum of its proper divisors (14814164130242).

21100122222142 is a wasteful number, since it uses less digits than its factorization.

21100122222142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315833.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21100122222142 its reverse (24122222100112), we get a palindrome (45222344322254).

The spelling of 21100122222142 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred forty-two".