5011900021 has 2 divisors, whose sum is σ = 5011900022. Its totient is φ = 5011900020.

The previous prime is 5011900007. The next prime is 5011900063. The reversal of 5011900021 is 1200091105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3359477521 + 1652422500 = 57961^2 + 40650^2 .

It is a cyclic number.

It is not a de Polignac number, because 5011900021 - 2⁵ = 5011899989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5011901021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2505950010 + 2505950011.

It is an arithmetic number, because the mean of its divisors is an integer number (2505950011).

Almost surely, 2^5011900021 is an apocalyptic number.

It is an amenable number.

5011900021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5011900021 is an equidigital number, since it uses as much as digits as its factorization.

5011900021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 5011900021 is about 70794.7739667272. The cubic root of 5011900021 is about 1711.3314551845.

Adding to 5011900021 its reverse (1200091105), we get a palindrome (6211991126).

The spelling of 5011900021 in words is "five billion, eleven million, nine hundred thousand, twenty-one".