1022205521 has 2 divisors, whose sum is σ = 1022205522. Its totient is φ = 1022205520.

The previous prime is 1022205479. The next prime is 1022205539. The reversal of 1022205521 is 1255022201.

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., 657204496 + 365001025 = 25636^2 + 19105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022205521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1022205493 and 1022205502.

It is not a weakly prime, because it can be changed into another prime (1022205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511102760 + 511102761.

It is an arithmetic number, because the mean of its divisors is an integer number (511102761).

Almost surely, 2^1022205521 is an apocalyptic number.

It is an amenable number.

1022205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022205521 is an equidigital number, since it uses as much as digits as its factorization.

1022205521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1022205521 is about 31971.9489709339. The cubic root of 1022205521 is about 1007.3477191250.

Adding to 1022205521 its reverse (1255022201), we get a palindrome (2277227722).

The spelling of 1022205521 in words is "one billion, twenty-two million, two hundred five thousand, five hundred twenty-one".