1321023021377 has 2 divisors, whose sum is σ = 1321023021378. Its totient is φ = 1321023021376.

The previous prime is 1321023021347. The next prime is 1321023021389. The reversal of 1321023021377 is 7731203201231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761577363856 + 559445657521 = 872684^2 + 747961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321023021377 - 2¹⁸ = 1321022759233 is a prime.

It is a super-2 number, since 2×1321023021377² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321023021347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660511510688 + 660511510689.

It is an arithmetic number, because the mean of its divisors is an integer number (660511510689).

Almost surely, 2^{1321023021377} is an apocalyptic number.

It is an amenable number.

1321023021377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321023021377 is an equidigital number, since it uses as much as digits as its factorization.

1321023021377 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 32.

The spelling of 1321023021377 in words is "one trillion, three hundred twenty-one billion, twenty-three million, twenty-one thousand, three hundred seventy-seven".