243155102021 has 8 divisors (see below), whose sum is σ = 261868526304. Its totient is φ = 224442990000.

The previous prime is 243155102017. The next prime is 243155102051. The reversal of 243155102021 is 120201551342.

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 243155102021 - 2² = 243155102017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155102051) 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, 75146 + ... + 701396.

It is an arithmetic number, because the mean of its divisors is an integer number (32733565788).

Almost surely, 2^243155102021 is an apocalyptic number.

It is an amenable number.

243155102021 is a deficient number, since it is larger than the sum of its proper divisors (18713424283).

243155102021 is a wasteful number, since it uses less digits than its factorization.

243155102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656131.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 243155102021 its reverse (120201551342), we get a palindrome (363356653363).

The spelling of 243155102021 in words is "two hundred forty-three billion, one hundred fifty-five million, one hundred two thousand, twenty-one".