721221122099 has 2 divisors, whose sum is σ = 721221122100. Its totient is φ = 721221122098.

The previous prime is 721221122059. The next prime is 721221122137. The reversal of 721221122099 is 990221122127.

721221122099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (721221122137) can be obtained adding 721221122099 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721221122099 - 2³² = 716926154803 is a prime.

It is not a weakly prime, because it can be changed into another prime (721221122059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360610561049 + 360610561050.

It is an arithmetic number, because the mean of its divisors is an integer number (360610561050).

Almost surely, 2^721221122099 is an apocalyptic number.

721221122099 is a deficient number, since it is larger than the sum of its proper divisors (1).

721221122099 is an equidigital number, since it uses as much as digits as its factorization.

721221122099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 721221122099 in words is "seven hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, ninety-nine".