20121221110037 has 2 divisors, whose sum is σ = 20121221110038. Its totient is φ = 20121221110036.

The previous prime is 20121221110019. The next prime is 20121221110121. The reversal of 20121221110037 is 73001112212102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18232976860081 + 1888244249956 = 4270009^2 + 1374134^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121221110037 - 2⁴⁴ = 2529035065621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121221109994 and 20121221110021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121221110007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060610555018 + 10060610555019.

It is an arithmetic number, because the mean of its divisors is an integer number (10060610555019).

Almost surely, 2^{20121221110037} is an apocalyptic number.

It is an amenable number.

20121221110037 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121221110037 is an equidigital number, since it uses as much as digits as its factorization.

20121221110037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 20121221110037 its reverse (73001112212102), we get a palindrome (93122333322139).

The spelling of 20121221110037 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, thirty-seven".