21619787659 has 8 divisors (see below), whose sum is σ = 22766406480. Its totient is φ = 20474042400.

The previous prime is 21619787647. The next prime is 21619787713. The reversal of 21619787659 is 95678791612.

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 21619787659 - 2¹⁹ = 21619263371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21619787597 and 21619787606.

It is not an unprimeable number, because it can be changed into a prime (21619787459) 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, 167272 + ... + 266869.

It is an arithmetic number, because the mean of its divisors is an integer number (2845800810).

Almost surely, 2^21619787659 is an apocalyptic number.

21619787659 is a deficient number, since it is larger than the sum of its proper divisors (1146618821).

21619787659 is a wasteful number, since it uses less digits than its factorization.

21619787659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436781.

The product of its digits is 11430720, while the sum is 61.

The spelling of 21619787659 in words is "twenty-one billion, six hundred nineteen million, seven hundred eighty-seven thousand, six hundred fifty-nine".