72121274947 has 8 divisors (see below), whose sum is σ = 72504198144. Its totient is φ = 71738883528.

The previous prime is 72121274921. The next prime is 72121274987. The reversal of 72121274947 is 74947212127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72121274947 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72121274897 and 72121274906.

It is not an unprimeable number, because it can be changed into a prime (72121274987) 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, 140508 + ... + 404950.

It is an arithmetic number, because the mean of its divisors is an integer number (9063024768).

Almost surely, 2^72121274947 is an apocalyptic number.

72121274947 is a deficient number, since it is larger than the sum of its proper divisors (382923197).

72121274947 is a wasteful number, since it uses less digits than its factorization.

72121274947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265889.

The product of its digits is 395136, while the sum is 46.

The spelling of 72121274947 in words is "seventy-two billion, one hundred twenty-one million, two hundred seventy-four thousand, nine hundred forty-seven".