1222145120 has 96 divisors (see below), whose sum is σ = 3339802368. Its totient is φ = 413941248.

The previous prime is 1222145101. The next prime is 1222145137. The reversal of 1222145120 is 215412221.

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 = 1222145092 and 1222145101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86387 + ... + 99533.

It is an arithmetic number, because the mean of its divisors is an integer number (34789608).

Almost surely, 2^1222145120 is an apocalyptic number.

1222145120 is a gapful number since it is divisible by the number (10) 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 1222145120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669901184).

1222145120 is an abundant number, since it is smaller than the sum of its proper divisors (2117657248).

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

1222145120 is a wasteful number, since it uses less digits than its factorization.

1222145120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13252 (or 13244 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1222145120 is about 34959.1922103472. The cubic root of 1222145120 is about 1069.1556269781.

Adding to 1222145120 its reverse (215412221), we get a palindrome (1437557341).

The spelling of 1222145120 in words is "one billion, two hundred twenty-two million, one hundred forty-five thousand, one hundred twenty".