247141921 has 4 divisors (see below), whose sum is σ = 266152852. Its totient is φ = 228130992.

The previous prime is 247141897. The next prime is 247141943. The reversal of 247141921 is 129141742.

247141921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129141742 = 2 ⋅64570871.

It can be written as a sum of positive squares in 2 ways, for example, as 152176896 + 94965025 = 12336^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 247141921 - 2⁷ = 247141793 is a prime.

It is a super-2 number, since 2×247141921² = 122158258231140482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247141421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9505446 + ... + 9505471.

It is an arithmetic number, because the mean of its divisors is an integer number (66538213).

Almost surely, 2^247141921 is an apocalyptic number.

It is an amenable number.

247141921 is a deficient number, since it is larger than the sum of its proper divisors (19010931).

247141921 is a wasteful number, since it uses less digits than its factorization.

247141921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010930.

The product of its digits is 4032, while the sum is 31.

The square root of 247141921 is about 15720.7481056087. The cubic root of 247141921 is about 627.5506821918.

The spelling of 247141921 in words is "two hundred forty-seven million, one hundred forty-one thousand, nine hundred twenty-one".