1222201211220 has 144 divisors (see below), whose sum is σ = 4069188107712. Its totient is φ = 294473387520.

The previous prime is 1222201211219. The next prime is 1222201211221. The reversal of 1222201211220 is 221121022221.

It is a happy number.

1222201211220 is a `hidden beast` number, since 1 + 222 + 201 + 21 + 1 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (1222201211219) and next prime (1222201211221).

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 = 1222201211193 and 1222201211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222201211221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1570737 + ... + 2216216.

It is an arithmetic number, because the mean of its divisors is an integer number (28258250748).

Almost surely, 2^{1222201211220} is an apocalyptic number.

1222201211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222201211220 is an abundant number, since it is smaller than the sum of its proper divisors (2846986896492).

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

1222201211220 is a wasteful number, since it uses less digits than its factorization.

1222201211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3787142 (or 3787137 counting only the distinct ones).

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

Adding to 1222201211220 its reverse (221121022221), we get a palindrome (1443322233441).

The spelling of 1222201211220 in words is "one trillion, two hundred twenty-two billion, two hundred one million, two hundred eleven thousand, two hundred twenty".