72121299 has 8 divisors (see below), whose sum is σ = 97479312. Its totient is φ = 47422080.

The previous prime is 72121271. The next prime is 72121331. The reversal of 72121299 is 99212127.

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

It is not a de Polignac number, because 72121299 - 2⁸ = 72121043 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72121229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164442 + ... + 164879.

It is an arithmetic number, because the mean of its divisors is an integer number (12184914).

Almost surely, 2^72121299 is an apocalyptic number.

72121299 is a deficient number, since it is larger than the sum of its proper divisors (25358013).

72121299 is a wasteful number, since it uses less digits than its factorization.

72121299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329397.

The product of its digits is 4536, while the sum is 33.

The square root of 72121299 is about 8492.4259784822. The cubic root of 72121299 is about 416.2502558413.

The spelling of 72121299 in words is "seventy-two million, one hundred twenty-one thousand, two hundred ninety-nine".