20111221220022 has 64 divisors (see below), whose sum is σ = 45439937269440. Its totient is φ = 6592370623488.

The previous prime is 20111221220009. The next prime is 20111221220023. The reversal of 20111221220022 is 22002212211102.

It is a happy number.

20111221220022 is a `hidden beast` number, since 201 + 1 + 1 + 221 + 220 + 0 + 22 = 666.

It is a super-2 number, since 2×20111221220022² (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 = 20111221219977 and 20111221220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111221220023) 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, 11405293 + ... + 13050024.

It is an arithmetic number, because the mean of its divisors is an integer number (709999019835).

Almost surely, 2^{20111221220022} is an apocalyptic number.

20111221220022 is an abundant number, since it is smaller than the sum of its proper divisors (25328716049418).

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

20111221220022 is a wasteful number, since it uses less digits than its factorization.

20111221220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24455582 (or 24455576 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20111221220022 its reverse (22002212211102), we get a palindrome (42113433431124).

The spelling of 20111221220022 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, twenty-two".