72121697903 has 8 divisors (see below), whose sum is σ = 75995781120. Its totient is φ = 68255435160.

The previous prime is 72121697897. The next prime is 72121697911. The reversal of 72121697903 is 30979612127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72121697903 - 2⁸ = 72121697647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72121697933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1936175 + ... + 1973072.

It is an arithmetic number, because the mean of its divisors is an integer number (9499472640).

Almost surely, 2^72121697903 is an apocalyptic number.

72121697903 is a deficient number, since it is larger than the sum of its proper divisors (3874083217).

72121697903 is a wasteful number, since it uses less digits than its factorization.

72121697903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910237.

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 72121697903 in words is "seventy-two billion, one hundred twenty-one million, six hundred ninety-seven thousand, nine hundred three".