1321229772061 has 2 divisors, whose sum is σ = 1321229772062. Its totient is φ = 1321229772060.

The previous prime is 1321229772053. The next prime is 1321229772091. The reversal of 1321229772061 is 1602779221231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810169208836 + 511060563225 = 900094^2 + 714885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321229772061 - 2³ = 1321229772053 is a prime.

It is a super-2 number, since 2×1321229772061² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321229771999 and 1321229772017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321229772091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660614886030 + 660614886031.

It is an arithmetic number, because the mean of its divisors is an integer number (660614886031).

Almost surely, 2^{1321229772061} is an apocalyptic number.

It is an amenable number.

1321229772061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321229772061 is an equidigital number, since it uses as much as digits as its factorization.

1321229772061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 1321229772061 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-nine million, seven hundred seventy-two thousand, sixty-one".