501420342121 has 4 divisors (see below), whose sum is σ = 501533101312. Its totient is φ = 501307582932.

The previous prime is 501420342119. The next prime is 501420342133. The reversal of 501420342121 is 121243024105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501420342121 - 2¹ = 501420342119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501420342721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56372925 + ... + 56381818.

It is an arithmetic number, because the mean of its divisors is an integer number (125383275328).

Almost surely, 2^501420342121 is an apocalyptic number.

It is an amenable number.

501420342121 is a deficient number, since it is larger than the sum of its proper divisors (112759191).

501420342121 is a wasteful number, since it uses less digits than its factorization.

501420342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112759190.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 501420342121 its reverse (121243024105), we get a palindrome (622663366226).

The spelling of 501420342121 in words is "five hundred one billion, four hundred twenty million, three hundred forty-two thousand, one hundred twenty-one".