1221243242 has 16 divisors (see below), whose sum is σ = 1885373280. Its totient is φ = 593035152.

The previous prime is 1221243223. The next prime is 1221243269. The reversal of 1221243242 is 2423421221.

It is a super-2 number, since 2×1221243242² = 2982870112261341128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52553 + ... + 72140.

It is an arithmetic number, because the mean of its divisors is an integer number (117835830).

Almost surely, 2^1221243242 is an apocalyptic number.

1221243242 is a deficient number, since it is larger than the sum of its proper divisors (664130038).

1221243242 is a wasteful number, since it uses less digits than its factorization.

1221243242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124837.

The product of its digits is 1536, while the sum is 23.

The square root of 1221243242 is about 34946.2908189124. The cubic root of 1221243242 is about 1068.8925689588.

Adding to 1221243242 its reverse (2423421221), we get a palindrome (3644664463).

The spelling of 1221243242 in words is "one billion, two hundred twenty-one million, two hundred forty-three thousand, two hundred forty-two".