11021220199961 has 2 divisors, whose sum is σ = 11021220199962. Its totient is φ = 11021220199960.

The previous prime is 11021220199933. The next prime is 11021220200033. The reversal of 11021220199961 is 16999102212011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10998011505625 + 23208694336 = 3316325^2 + 152344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021220199961 is a prime.

It is not a weakly prime, because it can be changed into another prime (11021220190961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510610099980 + 5510610099981.

It is an arithmetic number, because the mean of its divisors is an integer number (5510610099981).

Almost surely, 2^{11021220199961} is an apocalyptic number.

It is an amenable number.

11021220199961 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021220199961 is an equidigital number, since it uses as much as digits as its factorization.

11021220199961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 11021220199961 in words is "eleven trillion, twenty-one billion, two hundred twenty million, one hundred ninety-nine thousand, nine hundred sixty-one".