2221222221000 has 384 divisors, whose sum is σ = 7716657218400. Its totient is φ = 575867750400.

The previous prime is 2221222220993. The next prime is 2221222221047. The reversal of 2221222221000 is 1222221222.

2221222221000 is a `hidden beast` number, since 2 + 221 + 222 + 221 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 28044861156 + 2193177359844 = 167466^2 + 1480938^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 763567546 + ... + 763570454.

Almost surely, 2^{2221222221000} is an apocalyptic number.

2221222221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221222221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3858328609200).

2221222221000 is an abundant number, since it is smaller than the sum of its proper divisors (5495434997400).

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

2221222221000 is a wasteful number, since it uses less digits than its factorization.

2221222221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266 (or 5249 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 2221222221000 its reverse (1222221222), we get a palindrome (2222444442222).

It can be divided in two parts, 22212222 and 21000, that added together give a palindrome (22233222).

The spelling of 2221222221000 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand".