1020221120077 has 2 divisors, whose sum is σ = 1020221120078. Its totient is φ = 1020221120076.

The previous prime is 1020221120057. The next prime is 1020221120147. The reversal of 1020221120077 is 7700211220201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778972168836 + 241248951241 = 882594^2 + 491171^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020221120077 - 2⁷ = 1020221119949 is a prime.

It is a super-2 number, since 2×1020221120077² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020221120057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110560038 + 510110560039.

It is an arithmetic number, because the mean of its divisors is an integer number (510110560039).

Almost surely, 2^{1020221120077} is an apocalyptic number.

It is an amenable number.

1020221120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020221120077 is an equidigital number, since it uses as much as digits as its factorization.

1020221120077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 1020221120077 its reverse (7700211220201), we get a palindrome (8720432340278).

The spelling of 1020221120077 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred twenty thousand, seventy-seven".