1220221110042 has 32 divisors (see below), whose sum is σ = 2958111783360. Its totient is φ = 369763972560.

The previous prime is 1220221110041. The next prime is 1220221110139. The reversal of 1220221110042 is 2400111220221.

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 = 1220221109997 and 1220221110024.

It is not an unprimeable number, because it can be changed into a prime (1220221110041) 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, 1027121553 + ... + 1027122740.

It is an arithmetic number, because the mean of its divisors is an integer number (92440993230).

Almost surely, 2^{1220221110042} is an apocalyptic number.

1220221110042 is an abundant number, since it is smaller than the sum of its proper divisors (1737890673318).

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

1220221110042 is a wasteful number, since it uses less digits than its factorization.

1220221110042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054244315 (or 2054244309 counting only the distinct ones).

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

Adding to 1220221110042 its reverse (2400111220221), we get a palindrome (3620332330263).

The spelling of 1220221110042 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred ten thousand, forty-two".