20031033221077 has 2 divisors, whose sum is σ = 20031033221078. Its totient is φ = 20031033221076.

The previous prime is 20031033221027. The next prime is 20031033221099. The reversal of 20031033221077 is 77012233013002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19778219347441 + 252813873636 = 4447271^2 + 502806^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031033221077 - 2¹⁹ = 20031032696789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031033221027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015516610538 + 10015516610539.

It is an arithmetic number, because the mean of its divisors is an integer number (10015516610539).

Almost surely, 2^{20031033221077} is an apocalyptic number.

It is an amenable number.

20031033221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031033221077 is an equidigital number, since it uses as much as digits as its factorization.

20031033221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 31.

Adding to 20031033221077 its reverse (77012233013002), we get a palindrome (97043266234079).

The spelling of 20031033221077 in words is "twenty trillion, thirty-one billion, thirty-three million, two hundred twenty-one thousand, seventy-seven".