21140193191 has 16 divisors (see below), whose sum is σ = 23577644160. Its totient is φ = 18820139520.

The previous prime is 21140193187. The next prime is 21140193211. The reversal of 21140193191 is 19139104112.

It is not a de Polignac number, because 21140193191 - 2² = 21140193187 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 (21140193091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312671 + ... + 374223.

It is an arithmetic number, because the mean of its divisors is an integer number (1473602760).

Almost surely, 2^21140193191 is an apocalyptic number.

21140193191 is a deficient number, since it is larger than the sum of its proper divisors (2437450969).

21140193191 is a wasteful number, since it uses less digits than its factorization.

21140193191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62506.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 21140193191 in words is "twenty-one billion, one hundred forty million, one hundred ninety-three thousand, one hundred ninety-one".