501102732421 has 4 divisors (see below), whose sum is σ = 501104713644. Its totient is φ = 501100751200.

The previous prime is 501102732413. The next prime is 501102732439. The reversal of 501102732421 is 124237201105.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219183148900 + 281919583521 = 468170^2 + 530961^2 .

It is a cyclic number.

It is not a de Polignac number, because 501102732421 - 2³ = 501102732413 is a prime.

It is a super-2 number, since 2×501102732421² (a number of 24 digits) contains 22 as substring.

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 501102732421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501102732121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544150 + ... + 1139431.

It is an arithmetic number, because the mean of its divisors is an integer number (125276178411).

Almost surely, 2^501102732421 is an apocalyptic number.

It is an amenable number.

501102732421 is a deficient number, since it is larger than the sum of its proper divisors (1981223).

501102732421 is a wasteful number, since it uses less digits than its factorization.

501102732421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981222.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 501102732421 its reverse (124237201105), we get a palindrome (625339933526).

The spelling of 501102732421 in words is "five hundred one billion, one hundred two million, seven hundred thirty-two thousand, four hundred twenty-one".