1220221001172 has 48 divisors (see below), whose sum is σ = 2853931449600. Its totient is φ = 405776437248.

The previous prime is 1220221001171. The next prime is 1220221001249. The reversal of 1220221001172 is 2711001220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221001171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55070448 + ... + 55092600.

It is an arithmetic number, because the mean of its divisors is an integer number (59456905200).

Almost surely, 2^{1220221001172} is an apocalyptic number.

1220221001172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220221001172 is an abundant number, since it is smaller than the sum of its proper divisors (1633710448428).

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

1220221001172 is a wasteful number, since it uses less digits than its factorization.

1220221001172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32832 (or 32830 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 1220221001172 its reverse (2711001220221), we get a palindrome (3931222221393).

The spelling of 1220221001172 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one thousand, one hundred seventy-two".