21210003037 has 2 divisors, whose sum is σ = 21210003038. Its totient is φ = 21210003036.

The previous prime is 21210003011. The next prime is 21210003041. The reversal of 21210003037 is 73030001212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19370794041 + 1839208996 = 139179^2 + 42886^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210003037 - 2⁷ = 21210002909 is a prime.

It is a super-4 number, since 4×21210003037⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210003047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605001518 + 10605001519.

It is an arithmetic number, because the mean of its divisors is an integer number (10605001519).

Almost surely, 2^21210003037 is an apocalyptic number.

It is an amenable number.

21210003037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210003037 is an equidigital number, since it uses as much as digits as its factorization.

21210003037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

Adding to 21210003037 its reverse (73030001212), we get a palindrome (94240004249).

The spelling of 21210003037 in words is "twenty-one billion, two hundred ten million, three thousand, thirty-seven".