1221862853 has 16 divisors (see below), whose sum is σ = 1282526784. Its totient is φ = 1163015040.

The previous prime is 1221862847. The next prime is 1221862871. The reversal of 1221862853 is 3582681221.

It is a cyclic number.

It is not a de Polignac number, because 1221862853 - 2¹⁰ = 1221861829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221862813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291851 + ... + 296007.

It is an arithmetic number, because the mean of its divisors is an integer number (80157924).

Almost surely, 2^1221862853 is an apocalyptic number.

It is an amenable number.

1221862853 is a deficient number, since it is larger than the sum of its proper divisors (60663931).

1221862853 is a wasteful number, since it uses less digits than its factorization.

1221862853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372.

The product of its digits is 46080, while the sum is 38.

The square root of 1221862853 is about 34955.1548845088. The cubic root of 1221862853 is about 1069.0733098067.

The spelling of 1221862853 in words is "one billion, two hundred twenty-one million, eight hundred sixty-two thousand, eight hundred fifty-three".