1221194688488 has 64 divisors (see below), whose sum is σ = 2451209472000. Its totient is φ = 569100672000.

The previous prime is 1221194688449. The next prime is 1221194688503. The reversal of 1221194688488 is 8848864911221.

It is a super-2 number, since 2×1221194688488² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a self number, because there is not a number n which added to its sum of digits gives 1221194688488.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2672273 + ... + 3095711.

It is an arithmetic number, because the mean of its divisors is an integer number (38300148000).

Almost surely, 2^{1221194688488} is an apocalyptic number.

It is an amenable number.

1221194688488 is an abundant number, since it is smaller than the sum of its proper divisors (1230014783512).

1221194688488 is a wasteful number, since it uses less digits than its factorization.

1221194688488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423906 (or 423902 counting only the distinct ones).

The product of its digits is 14155776, while the sum is 62.

The spelling of 1221194688488 in words is "one trillion, two hundred twenty-one billion, one hundred ninety-four million, six hundred eighty-eight thousand, four hundred eighty-eight".