1221220983 has 8 divisors (see below), whose sum is σ = 1628477568. Its totient is φ = 814055864.

The previous prime is 1221220981. The next prime is 1221221003. The reversal of 1221220983 is 3890221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221220983 - 2¹ = 1221220981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221220983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19510 + ... + 53132.

It is an arithmetic number, because the mean of its divisors is an integer number (203559696).

Almost surely, 2^1221220983 is an apocalyptic number.

1221220983 is a deficient number, since it is larger than the sum of its proper divisors (407256585).

1221220983 is a wasteful number, since it uses less digits than its factorization.

1221220983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45733.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1221220983 is about 34945.9723430326. The cubic root of 1221220983 is about 1068.8860748596.

The spelling of 1221220983 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-three".