21415768619 has 8 divisors (see below), whose sum is σ = 24477727488. Its totient is φ = 18354450600.

The previous prime is 21415768607. The next prime is 21415768637. The reversal of 21415768619 is 91686751412.

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 21415768619 - 2⁴ = 21415768603 is a prime.

It is a super-2 number, since 2×21415768619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415768639) 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, 86327 + ... + 224240.

It is an arithmetic number, because the mean of its divisors is an integer number (3059715936).

Almost surely, 2^21415768619 is an apocalyptic number.

21415768619 is a deficient number, since it is larger than the sum of its proper divisors (3061958869).

21415768619 is an equidigital number, since it uses as much as digits as its factorization.

21415768619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320425.

The product of its digits is 725760, while the sum is 50.

The spelling of 21415768619 in words is "twenty-one billion, four hundred fifteen million, seven hundred sixty-eight thousand, six hundred nineteen".