21202012037 has 2 divisors, whose sum is σ = 21202012038. Its totient is φ = 21202012036.

The previous prime is 21202012003. The next prime is 21202012121. The reversal of 21202012037 is 73021020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18244175041 + 2957836996 = 135071^2 + 54386^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202012037 - 2¹² = 21202007941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202011037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601006018 + 10601006019.

It is an arithmetic number, because the mean of its divisors is an integer number (10601006019).

Almost surely, 2^21202012037 is an apocalyptic number.

It is an amenable number.

21202012037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202012037 is an equidigital number, since it uses as much as digits as its factorization.

21202012037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21202012037 its reverse (73021020212), we get a palindrome (94223032249).

The spelling of 21202012037 in words is "twenty-one billion, two hundred two million, twelve thousand, thirty-seven".