21194599157 has 8 divisors (see below), whose sum is σ = 21935431680. Its totient is φ = 20457337680.

The previous prime is 21194599133. The next prime is 21194599183. The reversal of 21194599157 is 75199549112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21194599157 is a prime.

It is a super-2 number, since 2×21194599157² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21194599099 and 21194599108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194599117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880682 + ... + 904427.

It is an arithmetic number, because the mean of its divisors is an integer number (2741928960).

Almost surely, 2^21194599157 is an apocalyptic number.

It is an amenable number.

21194599157 is a deficient number, since it is larger than the sum of its proper divisors (740832523).

21194599157 is a wasteful number, since it uses less digits than its factorization.

21194599157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785523.

The product of its digits is 1020600, while the sum is 53.

The spelling of 21194599157 in words is "twenty-one billion, one hundred ninety-four million, five hundred ninety-nine thousand, one hundred fifty-seven".