243155221442 has 24 divisors (see below), whose sum is σ = 424298089980. Its totient is φ = 104205195360.

The previous prime is 243155221433. The next prime is 243155221469. The reversal of 243155221442 is 244122551342.

It can be written as a sum of positive squares in 2 ways, for example, as 241315755121 + 1839466321 = 491239^2 + 42889^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4743284 + ... + 4794272.

Almost surely, 2^243155221442 is an apocalyptic number.

243155221442 is a deficient number, since it is larger than the sum of its proper divisors (181142868538).

243155221442 is a wasteful number, since it uses less digits than its factorization.

243155221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99666 (or 99659 counting only the distinct ones).

The product of its digits is 76800, while the sum is 35.

Adding to 243155221442 its reverse (244122551342), we get a palindrome (487277772784).

The spelling of 243155221442 in words is "two hundred forty-three billion, one hundred fifty-five million, two hundred twenty-one thousand, four hundred forty-two".