21514181819 has 16 divisors (see below), whose sum is σ = 24677210880. Its totient is φ = 18691021440.

The previous prime is 21514181813. The next prime is 21514181839. The reversal of 21514181819 is 91818141512.

It is a de Polignac number, because none of the positive numbers 2^k-21514181819 is a prime.

It is a super-2 number, since 2×21514181819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21514181813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250667 + ... + 325364.

It is an arithmetic number, because the mean of its divisors is an integer number (1542325680).

Almost surely, 2^21514181819 is an apocalyptic number.

21514181819 is a deficient number, since it is larger than the sum of its proper divisors (3163029061).

21514181819 is an equidigital number, since it uses as much as digits as its factorization.

21514181819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576087 (or 576061 counting only the distinct ones).

The product of its digits is 23040, while the sum is 41.

The spelling of 21514181819 in words is "twenty-one billion, five hundred fourteen million, one hundred eighty-one thousand, eight hundred nineteen".