97221721388 has 24 divisors (see below), whose sum is σ = 187690562640. Its totient is φ = 43695153920.

The previous prime is 97221721343. The next prime is 97221721411. The reversal of 97221721388 is 88312712279.

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, 12409481 + ... + 12417312.

It is an arithmetic number, because the mean of its divisors is an integer number (7820440110).

Almost surely, 2^97221721388 is an apocalyptic number.

It is an amenable number.

97221721388 is a deficient number, since it is larger than the sum of its proper divisors (90468841252).

97221721388 is a wasteful number, since it uses less digits than its factorization.

97221721388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24826897 (or 24826895 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The spelling of 97221721388 in words is "ninety-seven billion, two hundred twenty-one million, seven hundred twenty-one thousand, three hundred eighty-eight".