501010061021 has 2 divisors, whose sum is σ = 501010061022. Its totient is φ = 501010061020.

The previous prime is 501010061009. The next prime is 501010061023. The reversal of 501010061021 is 120160010105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347905327225 + 153104733796 = 589835^2 + 391286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501010061021 is a prime.

It is a super-2 number, since 2×501010061021² (a number of 24 digits) contains 22 as substring.

Together with 501010061023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501010061023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250505030510 + 250505030511.

It is an arithmetic number, because the mean of its divisors is an integer number (250505030511).

Almost surely, 2^501010061021 is an apocalyptic number.

It is an amenable number.

501010061021 is a deficient number, since it is larger than the sum of its proper divisors (1).

501010061021 is an equidigital number, since it uses as much as digits as its factorization.

501010061021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 501010061021 its reverse (120160010105), we get a palindrome (621170071126).

The spelling of 501010061021 in words is "five hundred one billion, ten million, sixty-one thousand, twenty-one".