1221248939 has 4 divisors (see below), whose sum is σ = 1221581040. Its totient is φ = 1220916840.

The previous prime is 1221248933. The next prime is 1221248981. The reversal of 1221248939 is 9398421221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221248939 - 2⁴ = 1221248923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221248896 and 1221248905.

It is not an unprimeable number, because it can be changed into a prime (1221248933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160472 + ... + 167909.

It is an arithmetic number, because the mean of its divisors is an integer number (305395260).

Almost surely, 2^1221248939 is an apocalyptic number.

1221248939 is a deficient number, since it is larger than the sum of its proper divisors (332101).

1221248939 is an equidigital number, since it uses as much as digits as its factorization.

1221248939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332100.

The product of its digits is 62208, while the sum is 41.

The square root of 1221248939 is about 34946.3723296138. The cubic root of 1221248939 is about 1068.8942310551.

The spelling of 1221248939 in words is "one billion, two hundred twenty-one million, two hundred forty-eight thousand, nine hundred thirty-nine".