1221254442 has 32 divisors (see below), whose sum is σ = 2733724800. Its totient is φ = 404110944.

The previous prime is 1221254369. The next prime is 1221254471. The reversal of 1221254442 is 2444521221.

It is a happy number.

1221254442 is a `hidden beast` number, since 1 + 2 + 212 + 5 + 4 + 442 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 75142 + ... + 89937.

It is an arithmetic number, because the mean of its divisors is an integer number (85428900).

Almost surely, 2^1221254442 is an apocalyptic number.

1221254442 is an abundant number, since it is smaller than the sum of its proper divisors (1512470358).

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

1221254442 is a wasteful number, since it uses less digits than its factorization.

1221254442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165227 (or 165221 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 1221254442 is about 34946.4510644500. The cubic root of 1221254442 is about 1068.8958365471.

Adding to 1221254442 its reverse (2444521221), we get a palindrome (3665775663).

The spelling of 1221254442 in words is "one billion, two hundred twenty-one million, two hundred fifty-four thousand, four hundred forty-two".