42154221451 has 6 divisors (see below), whose sum is σ = 44066700860. Its totient is φ = 40321428708.

The previous prime is 42154221449. The next prime is 42154221469. The reversal of 42154221451 is 15412245124.

It is not a de Polignac number, because 42154221451 - 2¹ = 42154221449 is a prime.

It is a super-2 number, since 2×42154221451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42154224451) 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 5 ways as a sum of consecutive naturals, for example, 39842781 + ... + 39843838.

Almost surely, 2^42154221451 is an apocalyptic number.

42154221451 is a deficient number, since it is larger than the sum of its proper divisors (1912479409).

42154221451 is an equidigital number, since it uses as much as digits as its factorization.

42154221451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79686665 (or 79686642 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

Adding to 42154221451 its reverse (15412245124), we get a palindrome (57566466575).

The spelling of 42154221451 in words is "forty-two billion, one hundred fifty-four million, two hundred twenty-one thousand, four hundred fifty-one".