2111011010921 has 2 divisors, whose sum is σ = 2111011010922. Its totient is φ = 2111011010920.

The previous prime is 2111011010909. The next prime is 2111011011001. The reversal of 2111011010921 is 1290101101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1851763032025 + 259247978896 = 1360795^2 + 509164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111011010921 - 2³⁸ = 1836133103977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111011010893 and 2111011010902.

It is not a weakly prime, because it can be changed into another prime (2111011010021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055505505460 + 1055505505461.

It is an arithmetic number, because the mean of its divisors is an integer number (1055505505461).

Almost surely, 2^{2111011010921} is an apocalyptic number.

It is an amenable number.

2111011010921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111011010921 is an equidigital number, since it uses as much as digits as its factorization.

2111011010921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 2111011010921 in words is "two trillion, one hundred eleven billion, eleven million, ten thousand, nine hundred twenty-one".