243121021497 has 12 divisors (see below), whose sum is σ = 351296824320. Its totient is φ = 162024366168.

The previous prime is 243121021489. The next prime is 243121021513. The reversal of 243121021497 is 794120121342.

243121021497 is a `hidden beast` number, since 2 + 43 + 121 + 0 + 2 + 1 + 497 = 666.

It is not a de Polignac number, because 243121021497 - 2³ = 243121021489 is a prime.

It is a super-2 number, since 2×243121021497² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243121021447) 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 11 ways as a sum of consecutive naturals, for example, 4665553 + ... + 4717374.

It is an arithmetic number, because the mean of its divisors is an integer number (29274735360).

Almost surely, 2^243121021497 is an apocalyptic number.

It is an amenable number.

243121021497 is a deficient number, since it is larger than the sum of its proper divisors (108175802823).

243121021497 is a wasteful number, since it uses less digits than its factorization.

243121021497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9385812 (or 9385809 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 243121021497 in words is "two hundred forty-three billion, one hundred twenty-one million, twenty-one thousand, four hundred ninety-seven".