42154221261 has 24 divisors (see below), whose sum is σ = 57640789920. Its totient is φ = 27402683616.

The previous prime is 42154221257. The next prime is 42154221271. The reversal of 42154221261 is 16212245124.

It is not a de Polignac number, because 42154221261 - 2² = 42154221257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42154221271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3427455 + ... + 3439731.

It is an arithmetic number, because the mean of its divisors is an integer number (2401699580).

Almost surely, 2^42154221261 is an apocalyptic number.

It is an amenable number.

42154221261 is a deficient number, since it is larger than the sum of its proper divisors (15486568659).

42154221261 is a wasteful number, since it uses less digits than its factorization.

42154221261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12985 (or 12942 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

Adding to 42154221261 its reverse (16212245124), we get a palindrome (58366466385).

The spelling of 42154221261 in words is "forty-two billion, one hundred fifty-four million, two hundred twenty-one thousand, two hundred sixty-one".