10990601821 has 2 divisors, whose sum is σ = 10990601822. Its totient is φ = 10990601820.

The previous prime is 10990601803. The next prime is 10990601879. The reversal of 10990601821 is 12810609901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9524784025 + 1465817796 = 97595^2 + 38286^2 .

It is a cyclic number.

It is not a de Polignac number, because 10990601821 - 2⁵ = 10990601789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10990601521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495300910 + 5495300911.

It is an arithmetic number, because the mean of its divisors is an integer number (5495300911).

Almost surely, 2^10990601821 is an apocalyptic number.

It is an amenable number.

10990601821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10990601821 is an equidigital number, since it uses as much as digits as its factorization.

10990601821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 10990601821 in words is "ten billion, nine hundred ninety million, six hundred one thousand, eight hundred twenty-one".