2221220121012 has 72 divisors (see below), whose sum is σ = 5853729065184. Its totient is φ = 709542864576.

The previous prime is 2221220121011. The next prime is 2221220121019. The reversal of 2221220121012 is 2101210221222.

It is a happy number.

2221220121012 is a `hidden beast` number, since 2 + 221 + 220 + 1 + 210 + 12 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221220121011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13454718 + ... + 13618805.

It is an arithmetic number, because the mean of its divisors is an integer number (81301792572).

Almost surely, 2^{2221220121012} is an apocalyptic number.

It is an amenable number.

2221220121012 is an abundant number, since it is smaller than the sum of its proper divisors (3632508944172).

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

2221220121012 is a wasteful number, since it uses less digits than its factorization.

2221220121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27073629 (or 27073624 counting only the distinct ones).

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

Adding to 2221220121012 its reverse (2101210221222), we get a palindrome (4322430342234).

The spelling of 2221220121012 in words is "two trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twelve".