1221304542875 has 8 divisors (see below), whose sum is σ = 1524188069664. Its totient is φ = 977043634200.

The previous prime is 1221304542793. The next prime is 1221304542881. The reversal of 1221304542875 is 5782454031221.

It is not a de Polignac number, because 1221304542875 - 2¹⁸ = 1221304280731 is a prime.

It is a super-2 number, since 2×1221304542875² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 4885218047 + ... + 4885218296.

It is an arithmetic number, because the mean of its divisors is an integer number (190523508708).

Almost surely, 2^{1221304542875} is an apocalyptic number.

1221304542875 is a deficient number, since it is larger than the sum of its proper divisors (302883526789).

1221304542875 is an frugal number, since it uses more digits than its factorization.

1221304542875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9770436358 (or 9770436348 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 1221304542875 in words is "one trillion, two hundred twenty-one billion, three hundred four million, five hundred forty-two thousand, eight hundred seventy-five".