21418153719 has 4 divisors (see below), whose sum is σ = 28557538296. Its totient is φ = 14278769144.

The previous prime is 21418153697. The next prime is 21418153723. The reversal of 21418153719 is 91735181412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21418153719 - 2¹³ = 21418145527 is a prime.

It is a super-2 number, since 2×21418153719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418153739) 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 3 ways as a sum of consecutive naturals, for example, 3569692284 + ... + 3569692289.

It is an arithmetic number, because the mean of its divisors is an integer number (7139384574).

Almost surely, 2^21418153719 is an apocalyptic number.

21418153719 is a deficient number, since it is larger than the sum of its proper divisors (7139384577).

21418153719 is an equidigital number, since it uses as much as digits as its factorization.

21418153719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139384576.

The product of its digits is 60480, while the sum is 42.

The spelling of 21418153719 in words is "twenty-one billion, four hundred eighteen million, one hundred fifty-three thousand, seven hundred nineteen".