42121045421 has 16 divisors (see below), whose sum is σ = 53242406784. Its totient is φ = 32425821504.

The previous prime is 42121045409. The next prime is 42121045429. The reversal of 42121045421 is 12454012124.

It is a cyclic number.

It is not a de Polignac number, because 42121045421 - 2¹⁴ = 42121029037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121045429) 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, 6251615 + ... + 6258348.

It is an arithmetic number, because the mean of its divisors is an integer number (3327650424).

Almost surely, 2^42121045421 is an apocalyptic number.

It is an amenable number.

42121045421 is a deficient number, since it is larger than the sum of its proper divisors (11121361363).

42121045421 is a wasteful number, since it uses less digits than its factorization.

42121045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510020.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 42121045421 its reverse (12454012124), we get a palindrome (54575057545).

The spelling of 42121045421 in words is "forty-two billion, one hundred twenty-one million, forty-five thousand, four hundred twenty-one".