21101100020149 has 2 divisors, whose sum is σ = 21101100020150. Its totient is φ = 21101100020148.

The previous prime is 21101100020123. The next prime is 21101100020227. The reversal of 21101100020149 is 94102000110112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16882155264100 + 4218944756049 = 4108790^2 + 2054007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101100020149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101100020449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550010074 + 10550550010075.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550010075).

Almost surely, 2^{21101100020149} is an apocalyptic number.

It is an amenable number.

21101100020149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100020149 is an equidigital number, since it uses as much as digits as its factorization.

21101100020149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21101100020149 in words is "twenty-one trillion, one hundred one billion, one hundred million, twenty thousand, one hundred forty-nine".