1221779931704 has 16 divisors (see below), whose sum is σ = 2290891608720. Its totient is φ = 610875502720.

The previous prime is 1221779931683. The next prime is 1221779931737. The reversal of 1221779931704 is 4071399771221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444577 + ... + 2128464.

It is an arithmetic number, because the mean of its divisors is an integer number (143180725545).

Almost surely, 2^{1221779931704} is an apocalyptic number.

It is an amenable number.

1221779931704 is a deficient number, since it is larger than the sum of its proper divisors (1069111677016).

1221779931704 is a wasteful number, since it uses less digits than its factorization.

1221779931704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615790 (or 3615786 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 1221779931704 in words is "one trillion, two hundred twenty-one billion, seven hundred seventy-nine million, nine hundred thirty-one thousand, seven hundred four".