20111221012122 has 20 divisors (see below), whose sum is σ = 45064032268266. Its totient is φ = 6703740337320.

The previous prime is 20111221012111. The next prime is 20111221012187. The reversal of 20111221012122 is 22121012211102.

20111221012122 is a `hidden beast` number, since 201 + 112 + 210 + 121 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19925769341241 + 185451670881 = 4463829^2 + 430641^2 .

It is a super-2 number, since 2×20111221012122² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20111221012095 and 20111221012104.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62071669629 + ... + 62071669952.

Almost surely, 2^{20111221012122} is an apocalyptic number.

20111221012122 is an abundant number, since it is smaller than the sum of its proper divisors (24952811256144).

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

20111221012122 is a wasteful number, since it uses less digits than its factorization.

20111221012122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124143339595 (or 124143339586 counting only the distinct ones).

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

Adding to 20111221012122 its reverse (22121012211102), we get a palindrome (42232233223224).

The spelling of 20111221012122 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, twelve thousand, one hundred twenty-two".