247060021 has 16 divisors (see below), whose sum is σ = 284267200. Its totient is φ = 212813568.

The previous prime is 247060013. The next prime is 247060117. The reversal of 247060021 is 120060742.

It is a cyclic number.

It is not a de Polignac number, because 247060021 - 2³ = 247060013 is a prime.

It is a super-3 number, since 3×247060021³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247059974 and 247060001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247060001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9085 + ... + 24013.

It is an arithmetic number, because the mean of its divisors is an integer number (17766700).

Almost surely, 2^247060021 is an apocalyptic number.

It is an amenable number.

247060021 is a deficient number, since it is larger than the sum of its proper divisors (37207179).

247060021 is a wasteful number, since it uses less digits than its factorization.

247060021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15028.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 247060021 is about 15718.1430519002. The cubic root of 247060021 is about 627.4813534985.

The spelling of 247060021 in words is "two hundred forty-seven million, sixty thousand, twenty-one".