1072206521 has 2 divisors, whose sum is σ = 1072206522. Its totient is φ = 1072206520.

The previous prime is 1072206503. The next prime is 1072206559. The reversal of 1072206521 is 1256022701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053716521 + 18490000 = 32461^2 + 4300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1072206521 is a prime.

It is a super-2 number, since 2×1072206521² = 2299253647349846882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1072206221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536103260 + 536103261.

It is an arithmetic number, because the mean of its divisors is an integer number (536103261).

Almost surely, 2^1072206521 is an apocalyptic number.

It is an amenable number.

1072206521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1072206521 is an equidigital number, since it uses as much as digits as its factorization.

1072206521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1072206521 is about 32744.5647550857. The cubic root of 1072206521 is about 1023.5117075160.

The spelling of 1072206521 in words is "one billion, seventy-two million, two hundred six thousand, five hundred twenty-one".