247933712921 has 8 divisors (see below), whose sum is σ = 248812983744. Its totient is φ = 247054968720.

The previous prime is 247933712911. The next prime is 247933712963. The reversal of 247933712921 is 129217339742.

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

It is a cyclic number.

It is not a de Polignac number, because 247933712921 - 2³⁰ = 246859971097 is a prime.

It is a super-2 number, since 2×247933712921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247933712921.

It is not an unprimeable number, because it can be changed into a prime (247933712911) 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, 823871 + ... + 1083803.

It is an arithmetic number, because the mean of its divisors is an integer number (31101622968).

Almost surely, 2^247933712921 is an apocalyptic number.

It is an amenable number.

247933712921 is a deficient number, since it is larger than the sum of its proper divisors (879270823).

247933712921 is a wasteful number, since it uses less digits than its factorization.

247933712921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263311.

The product of its digits is 1143072, while the sum is 50.

The spelling of 247933712921 in words is "two hundred forty-seven billion, nine hundred thirty-three million, seven hundred twelve thousand, nine hundred twenty-one".