2221212211220 has 48 divisors (see below), whose sum is σ = 4680956044800. Its totient is φ = 885364028160.

The previous prime is 2221212211213. The next prime is 2221212211249. The reversal of 2221212211220 is 221122121222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2221212211192 and 2221212211201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7078616 + ... + 7385744.

It is an arithmetic number, because the mean of its divisors is an integer number (97519917600).

Almost surely, 2^{2221212211220} is an apocalyptic number.

2221212211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221212211220 is an abundant number, since it is smaller than the sum of its proper divisors (2459743833580).

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

2221212211220 is a wasteful number, since it uses less digits than its factorization.

2221212211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308408 (or 308406 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221212211220 its reverse (221122121222), we get a palindrome (2442334332442).

The spelling of 2221212211220 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty".