42051312251 has 16 divisors (see below), whose sum is σ = 48444266304. Its totient is φ = 36156616704.

The previous prime is 42051312239. The next prime is 42051312257. The reversal of 42051312251 is 15221315024.

It is not a de Polignac number, because 42051312251 - 2²² = 42047117947 is a prime.

It is a super-2 number, since 2×42051312251² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42051312251.

It is not an unprimeable number, because it can be changed into a prime (42051312257) 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 15 ways as a sum of consecutive naturals, for example, 959375 + ... + 1002248.

It is an arithmetic number, because the mean of its divisors is an integer number (3027766644).

Almost surely, 2^42051312251 is an apocalyptic number.

42051312251 is a deficient number, since it is larger than the sum of its proper divisors (6392954053).

42051312251 is a wasteful number, since it uses less digits than its factorization.

42051312251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961750.

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

Adding to 42051312251 its reverse (15221315024), we get a palindrome (57272627275).

The spelling of 42051312251 in words is "forty-two billion, fifty-one million, three hundred twelve thousand, two hundred fifty-one".