21153045191 has 8 divisors (see below), whose sum is σ = 22291287264. Its totient is φ = 20033015200.

The previous prime is 21153045149. The next prime is 21153045203. The reversal of 21153045191 is 19154035112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21153045191 - 2¹⁰ = 21153044167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153045131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4550636 + ... + 4555281.

It is an arithmetic number, because the mean of its divisors is an integer number (2786410908).

Almost surely, 2^21153045191 is an apocalyptic number.

21153045191 is a deficient number, since it is larger than the sum of its proper divisors (1138242073).

21153045191 is a wasteful number, since it uses less digits than its factorization.

21153045191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9106041.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 21153045191 in words is "twenty-one billion, one hundred fifty-three million, forty-five thousand, one hundred ninety-one".