21145684219 has 16 divisors (see below), whose sum is σ = 23294926080. Its totient is φ = 19034436960.

The previous prime is 21145684201. The next prime is 21145684229. The reversal of 21145684219 is 91248654112.

It is not a de Polignac number, because 21145684219 - 2¹⁷ = 21145553147 is a prime.

It is a super-2 number, since 2×21145684219² (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 (21145684229) 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, 3903757 + ... + 3909169.

It is an arithmetic number, because the mean of its divisors is an integer number (1455932880).

Almost surely, 2^21145684219 is an apocalyptic number.

21145684219 is a deficient number, since it is larger than the sum of its proper divisors (2149241861).

21145684219 is a wasteful number, since it uses less digits than its factorization.

21145684219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8850.

The product of its digits is 138240, while the sum is 43.

The spelling of 21145684219 in words is "twenty-one billion, one hundred forty-five million, six hundred eighty-four thousand, two hundred nineteen".