221212100122101 has 32 divisors (see below), whose sum is σ = 358142826268800. Its totient is φ = 133832319085440.

The previous prime is 221212100122093. The next prime is 221212100122121. The reversal of 221212100122101 is 101221001212122.

221212100122101 is a `hidden beast` number, since 221 + 21 + 210 + 0 + 1 + 2 + 210 + 1 = 666.

It is not a de Polignac number, because 221212100122101 - 2³ = 221212100122093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212100122121) 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, 654331786 + ... + 654669771.

It is an arithmetic number, because the mean of its divisors is an integer number (11191963320900).

Almost surely, 2^{221212100122101} is an apocalyptic number.

It is an amenable number.

221212100122101 is a deficient number, since it is larger than the sum of its proper divisors (136930726146699).

221212100122101 is a wasteful number, since it uses less digits than its factorization.

221212100122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309002146 (or 1309002140 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221212100122101 its reverse (101221001212122), we get a palindrome (322433101334223).

The spelling of 221212100122101 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred million, one hundred twenty-two thousand, one hundred one".