21100122222138 has 24 divisors (see below), whose sum is σ = 45717129963648. Its totient is φ = 7033343538312.

The previous prime is 21100122222077. The next prime is 21100122222139. The reversal of 21100122222138 is 83122222100112.

21100122222138 is a `hidden beast` number, since 211 + 0 + 0 + 1 + 222 + 221 + 3 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21100122222139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1929081 + ... + 6776547.

It is an arithmetic number, because the mean of its divisors is an integer number (1904880415152).

Almost surely, 2^{21100122222138} is an apocalyptic number.

21100122222138 is an abundant number, since it is smaller than the sum of its proper divisors (24617007741510).

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

21100122222138 is a wasteful number, since it uses less digits than its factorization.

21100122222138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089298 (or 5089295 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 21100122222138 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred thirty-eight".