501212421 has 16 divisors (see below), whose sum is σ = 743246400. Its totient is φ = 333822384.

The previous prime is 501212407. The next prime is 501212443. The reversal of 501212421 is 124212105.

It is not a de Polignac number, because 501212421 - 2⁶ = 501212357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 501212394 and 501212403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501212401) 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, 21850 + ... + 38468.

It is an arithmetic number, because the mean of its divisors is an integer number (46452900).

Almost surely, 2^501212421 is an apocalyptic number.

It is an amenable number.

501212421 is a deficient number, since it is larger than the sum of its proper divisors (242033979).

501212421 is a wasteful number, since it uses less digits than its factorization.

501212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17745 (or 17739 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 501212421 is about 22387.7739179223. The cubic root of 501212421 is about 794.3415409332.

Adding to 501212421 its reverse (124212105), we get a palindrome (625424526).

The spelling of 501212421 in words is "five hundred one million, two hundred twelve thousand, four hundred twenty-one".