20121331073 has 2 divisors, whose sum is σ = 20121331074. Its totient is φ = 20121331072.

The previous prime is 20121331067. The next prime is 20121331099. The reversal of 20121331073 is 37013312102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15839984449 + 4281346624 = 125857^2 + 65432^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121331073 - 2¹⁶ = 20121265537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20121381073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060665536 + 10060665537.

It is an arithmetic number, because the mean of its divisors is an integer number (10060665537).

Almost surely, 2^20121331073 is an apocalyptic number.

It is an amenable number.

20121331073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121331073 is an equidigital number, since it uses as much as digits as its factorization.

20121331073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 20121331073 its reverse (37013312102), we get a palindrome (57134643175).

The spelling of 20121331073 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-one thousand, seventy-three".