501402420421 has 8 divisors (see below), whose sum is σ = 573086684480. Its totient is φ = 429731993088.

The previous prime is 501402420413. The next prime is 501402420443. The reversal of 501402420421 is 124024204105.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 501402420421 - 2³ = 501402420413 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 (501402420461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381411 + ... + 3526576.

It is an arithmetic number, because the mean of its divisors is an integer number (71635835560).

Almost surely, 2^501402420421 is an apocalyptic number.

It is an amenable number.

501402420421 is a deficient number, since it is larger than the sum of its proper divisors (71684264059).

501402420421 is a wasteful number, since it uses less digits than its factorization.

501402420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918363.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 501402420421 its reverse (124024204105), we get a palindrome (625426624526).

The spelling of 501402420421 in words is "five hundred one billion, four hundred two million, four hundred twenty thousand, four hundred twenty-one".