21619752995 has 8 divisors (see below), whose sum is σ = 26060044416. Its totient is φ = 17218241856.

The previous prime is 21619752991. The next prime is 21619753007. The reversal of 21619752995 is 59925791612.

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 21619752995 - 2² = 21619752991 is a prime.

It is a super-2 number, since 2×21619752995² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21619752995.

It is not an unprimeable number, because it can be changed into a prime (21619752991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9693842 + ... + 9696071.

It is an arithmetic number, because the mean of its divisors is an integer number (3257505552).

Almost surely, 2^21619752995 is an apocalyptic number.

21619752995 is a deficient number, since it is larger than the sum of its proper divisors (4440291421).

21619752995 is a wasteful number, since it uses less digits than its factorization.

21619752995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19390141.

The product of its digits is 3061800, while the sum is 56.

The spelling of 21619752995 in words is "twenty-one billion, six hundred nineteen million, seven hundred fifty-two thousand, nine hundred ninety-five".