7775056021 has 2 divisors, whose sum is σ = 7775056022. Its totient is φ = 7775056020.

The previous prime is 7775055983. The next prime is 7775056057. The reversal of 7775056021 is 1206505777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3920012100 + 3855043921 = 62610^2 + 62089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7775056021 is a prime.

It is a super-2 number, since 2×7775056021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7775056061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3887528010 + 3887528011.

It is an arithmetic number, because the mean of its divisors is an integer number (3887528011).

Almost surely, 2^7775056021 is an apocalyptic number.

It is an amenable number.

7775056021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7775056021 is an equidigital number, since it uses as much as digits as its factorization.

7775056021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 7775056021 is about 88176.2781081170. The cubic root of 7775056021 is about 1981.0761776259.

The spelling of 7775056021 in words is "seven billion, seven hundred seventy-five million, fifty-six thousand, twenty-one".