21194787699 has 16 divisors (see below), whose sum is σ = 32412579840. Its totient is φ = 13674056040.

The previous prime is 21194787667. The next prime is 21194787701. The reversal of 21194787699 is 99678749112.

21194787699 is a `hidden beast` number, since 2 + 1 + 1 + 9 + 478 + 76 + 99 = 666.

It is not a de Polignac number, because 21194787699 - 2⁵ = 21194787667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21194787619) 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, 12660327 + ... + 12662000.

It is an arithmetic number, because the mean of its divisors is an integer number (2025786240).

Almost surely, 2^21194787699 is an apocalyptic number.

21194787699 is a deficient number, since it is larger than the sum of its proper divisors (11217792141).

21194787699 is a wasteful number, since it uses less digits than its factorization.

21194787699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25322367 (or 25322361 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The spelling of 21194787699 in words is "twenty-one billion, one hundred ninety-four million, seven hundred eighty-seven thousand, six hundred ninety-nine".