21121012037 has 2 divisors, whose sum is σ = 21121012038. Its totient is φ = 21121012036.

The previous prime is 21121012021. The next prime is 21121012049. The reversal of 21121012037 is 73021012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21096400516 + 24611521 = 145246^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121012037 - 2⁴ = 21121012021 is a prime.

It is a super-3 number, since 3×21121012037³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121012837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560506018 + 10560506019.

It is an arithmetic number, because the mean of its divisors is an integer number (10560506019).

Almost surely, 2^21121012037 is an apocalyptic number.

It is an amenable number.

21121012037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121012037 is an equidigital number, since it uses as much as digits as its factorization.

21121012037 is an evil number, because the sum of its binary digits is even.

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

Adding to 21121012037 its reverse (73021012112), we get a palindrome (94142024149).

The spelling of 21121012037 in words is "twenty-one billion, one hundred twenty-one million, twelve thousand, thirty-seven".