2011000999921 has 2 divisors, whose sum is σ = 2011000999922. Its totient is φ = 2011000999920.

The previous prime is 2011000999873. The next prime is 2011000999963. The reversal of 2011000999921 is 1299990001102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1627573783696 + 383427216225 = 1275764^2 + 619215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011000999921 - 2⁹ = 2011000999409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2011000999621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005500499960 + 1005500499961.

It is an arithmetic number, because the mean of its divisors is an integer number (1005500499961).

Almost surely, 2^{2011000999921} is an apocalyptic number.

It is an amenable number.

2011000999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011000999921 is an equidigital number, since it uses as much as digits as its factorization.

2011000999921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 2011000999921 in words is "two trillion, eleven billion, nine hundred ninety-nine thousand, nine hundred twenty-one".