2191021267149 has 24 divisors (see below), whose sum is σ = 3718096697952. Its totient is φ = 1225746162720.

The previous prime is 2191021267093. The next prime is 2191021267159. The reversal of 2191021267149 is 9417621201912.

2191021267149 is a `hidden beast` number, since 219 + 10 + 21 + 267 + 149 = 666.

It is not a de Polignac number, because 2191021267149 - 2⁷ = 2191021267021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191021267159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 851211327 + ... + 851213900.

It is an arithmetic number, because the mean of its divisors is an integer number (154920695748).

Almost surely, 2^{2191021267149} is an apocalyptic number.

It is an amenable number.

2191021267149 is a deficient number, since it is larger than the sum of its proper divisors (1527075430803).

2191021267149 is a wasteful number, since it uses less digits than its factorization.

2191021267149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702425257 (or 1702425254 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 2191021267149 in words is "two trillion, one hundred ninety-one billion, twenty-one million, two hundred sixty-seven thousand, one hundred forty-nine".