11650831021 has 2 divisors, whose sum is σ = 11650831022. Its totient is φ = 11650831020.

The previous prime is 11650831019. The next prime is 11650831139. The reversal of 11650831021 is 12013805611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8670216996 + 2980614025 = 93114^2 + 54595^2 .

It is a cyclic number.

It is not a de Polignac number, because 11650831021 - 2¹ = 11650831019 is a prime.

Together with 11650831019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11650031021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5825415510 + 5825415511.

It is an arithmetic number, because the mean of its divisors is an integer number (5825415511).

Almost surely, 2^11650831021 is an apocalyptic number.

It is an amenable number.

11650831021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11650831021 is an equidigital number, since it uses as much as digits as its factorization.

11650831021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 11650831021 in words is "eleven billion, six hundred fifty million, eight hundred thirty-one thousand, twenty-one".