42501260021 has 16 divisors (see below), whose sum is σ = 46677012480. Its totient is φ = 38377852080.

The previous prime is 42501260017. The next prime is 42501260069. The reversal of 42501260021 is 12006210524.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42501260021 - 2² = 42501260017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42501260821) 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, 2723840 + ... + 2739398.

It is an arithmetic number, because the mean of its divisors is an integer number (2917313280).

Almost surely, 2^42501260021 is an apocalyptic number.

It is an amenable number.

42501260021 is a deficient number, since it is larger than the sum of its proper divisors (4175752459).

42501260021 is a wasteful number, since it uses less digits than its factorization.

42501260021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17224.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 42501260021 its reverse (12006210524), we get a palindrome (54507470545).

The spelling of 42501260021 in words is "forty-two billion, five hundred one million, two hundred sixty thousand, twenty-one".