21121210037 has 2 divisors, whose sum is σ = 21121210038. Its totient is φ = 21121210036.

The previous prime is 21121210007. The next prime is 21121210039. The reversal of 21121210037 is 73001212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19901873476 + 1219336561 = 141074^2 + 34919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121210037 is a prime.

It is a super-2 number, since 2×21121210037² (a number of 21 digits) contains 22 as substring.

Together with 21121210039, 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 (21121210039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560605018 + 10560605019.

It is an arithmetic number, because the mean of its divisors is an integer number (10560605019).

Almost surely, 2^21121210037 is an apocalyptic number.

It is an amenable number.

21121210037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121210037 is an equidigital number, since it uses as much as digits as its factorization.

21121210037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21121210037 its reverse (73001212112), we get a palindrome (94122422149).

The spelling of 21121210037 in words is "twenty-one billion, one hundred twenty-one million, two hundred ten thousand, thirty-seven".