247231021 has 16 divisors (see below), whose sum is σ = 264983040. Its totient is φ = 229990320.

The previous prime is 247231007. The next prime is 247231057. The reversal of 247231021 is 120132742.

It is a cyclic number.

It is not a de Polignac number, because 247231021 - 2⁹ = 247230509 is a prime.

It is a super-2 number, since 2×247231021² = 122246355489404882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247230983 and 247231001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247231321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332376 + ... + 333118.

It is an arithmetic number, because the mean of its divisors is an integer number (16561440).

Almost surely, 2^247231021 is an apocalyptic number.

It is an amenable number.

247231021 is a deficient number, since it is larger than the sum of its proper divisors (17752019).

247231021 is a wasteful number, since it uses less digits than its factorization.

247231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

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

The square root of 247231021 is about 15723.5816848452. The cubic root of 247231021 is about 627.6260883220.

Adding to 247231021 its reverse (120132742), we get a palindrome (367363763).

The spelling of 247231021 in words is "two hundred forty-seven million, two hundred thirty-one thousand, twenty-one".