42513103550021 has 16 divisors (see below), whose sum is σ = 46591959758400. Its totient is φ = 38550696371328.

The previous prime is 42513103550009. The next prime is 42513103550023. The reversal of 42513103550021 is 12005530131524.

It is a cyclic number.

It is not a de Polignac number, because 42513103550021 - 2¹⁸ = 42513103287877 is a prime.

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 42513103550021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42513103550023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18326576 + ... + 20515593.

It is an arithmetic number, because the mean of its divisors is an integer number (2911997484900).

Almost surely, 2^{42513103550021} is an apocalyptic number.

It is an amenable number.

42513103550021 is a deficient number, since it is larger than the sum of its proper divisors (4078856208379).

42513103550021 is a wasteful number, since it uses less digits than its factorization.

42513103550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38843668.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 42513103550021 its reverse (12005530131524), we get a palindrome (54518633681545).

The spelling of 42513103550021 in words is "forty-two trillion, five hundred thirteen billion, one hundred three million, five hundred fifty thousand, twenty-one".