1221240042 has 48 divisors (see below), whose sum is σ = 2912165568. Its totient is φ = 366791040.

The previous prime is 1221240023. The next prime is 1221240073. The reversal of 1221240042 is 2400421221.

1221240042 is a `hidden beast` number, since 1 + 221 + 2 + 400 + 42 = 666.

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 = 1221239997 and 1221240024.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4918 + ... + 49665.

It is an arithmetic number, because the mean of its divisors is an integer number (60670116).

Almost surely, 2^1221240042 is an apocalyptic number.

1221240042 is an abundant number, since it is smaller than the sum of its proper divisors (1690925526).

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

1221240042 is a wasteful number, since it uses less digits than its factorization.

1221240042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54715 (or 54712 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1221240042 is about 34946.2450343381. The cubic root of 1221240042 is about 1068.8916353585.

Adding to 1221240042 its reverse (2400421221), we get a palindrome (3621661263).

The spelling of 1221240042 in words is "one billion, two hundred twenty-one million, two hundred forty thousand, forty-two".