40021194591 has 24 divisors (see below), whose sum is σ = 66089840544. Its totient is φ = 22861255680.

The previous prime is 40021194569. The next prime is 40021194599. The reversal of 40021194591 is 19549112004.

It is a happy number.

40021194591 is a `hidden beast` number, since 40 + 0 + 21 + 1 + 9 + 4 + 591 = 666.

It is not a de Polignac number, because 40021194591 - 2¹³ = 40021186399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021194599) 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, 72871 + ... + 292151.

It is an arithmetic number, because the mean of its divisors is an integer number (2753743356).

Almost surely, 2^40021194591 is an apocalyptic number.

40021194591 is a deficient number, since it is larger than the sum of its proper divisors (26068645953).

40021194591 is a wasteful number, since it uses less digits than its factorization.

40021194591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222191 (or 222188 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 40021194591 in words is "forty billion, twenty-one million, one hundred ninety-four thousand, five hundred ninety-one".