42154221243 has 8 divisors (see below), whose sum is σ = 56206670400. Its totient is φ = 28102293128.

The previous prime is 42154221203. The next prime is 42154221257. The reversal of 42154221243 is 34212245124.

It is a happy number.

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 42154221243 - 2²⁰ = 42153172667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42154221243.

It is not an unprimeable number, because it can be changed into a prime (42154221203) 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, 136648 + ... + 320906.

It is an arithmetic number, because the mean of its divisors is an integer number (7025833800).

Almost surely, 2^42154221243 is an apocalyptic number.

42154221243 is a deficient number, since it is larger than the sum of its proper divisors (14052449157).

42154221243 is a wasteful number, since it uses less digits than its factorization.

42154221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260521.

The product of its digits is 15360, while the sum is 30.

Adding to 42154221243 its reverse (34212245124), we get a palindrome (76366466367).

The spelling of 42154221243 in words is "forty-two billion, one hundred fifty-four million, two hundred twenty-one thousand, two hundred forty-three".