501238021 has 2 divisors, whose sum is σ = 501238022. Its totient is φ = 501238020.

The previous prime is 501237953. The next prime is 501238027. The reversal of 501238021 is 120832105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254402500 + 246835521 = 15950^2 + 15711^2 .

It is a cyclic number.

It is not a de Polignac number, because 501238021 - 2¹³ = 501229829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 501237983 and 501238001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501238027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250619010 + 250619011.

It is an arithmetic number, because the mean of its divisors is an integer number (250619011).

Almost surely, 2^501238021 is an apocalyptic number.

It is an amenable number.

501238021 is a deficient number, since it is larger than the sum of its proper divisors (1).

501238021 is an equidigital number, since it uses as much as digits as its factorization.

501238021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 501238021 is about 22388.3456512535. The cubic root of 501238021 is about 794.3550646718.

The spelling of 501238021 in words is "five hundred one million, two hundred thirty-eight thousand, twenty-one".