10001120111621 has 2 divisors, whose sum is σ = 10001120111622. Its totient is φ = 10001120111620.

The previous prime is 10001120111581. The next prime is 10001120111657. The reversal of 10001120111621 is 12611102110001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8912081766721 + 1089038344900 = 2985311^2 + 1043570^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001120111621 - 2¹⁸ = 10001119849477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10001120111621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001120117621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000560055810 + 5000560055811.

It is an arithmetic number, because the mean of its divisors is an integer number (5000560055811).

Almost surely, 2^{10001120111621} is an apocalyptic number.

It is an amenable number.

10001120111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001120111621 is an equidigital number, since it uses as much as digits as its factorization.

10001120111621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 10001120111621 its reverse (12611102110001), we get a palindrome (22612222221622).

The spelling of 10001120111621 in words is "ten trillion, one billion, one hundred twenty million, one hundred eleven thousand, six hundred twenty-one".