21151145519 has 6 divisors (see below), whose sum is σ = 24604393824. Its totient is φ = 18129553260.

The previous prime is 21151145443. The next prime is 21151145567. The reversal of 21151145519 is 91554115112.

It is not a de Polignac number, because 21151145519 - 2⁸ = 21151145263 is a prime.

It is a super-2 number, since 2×21151145519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151145579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215827967 + ... + 215828064.

It is an arithmetic number, because the mean of its divisors is an integer number (4100732304).

Almost surely, 2^21151145519 is an apocalyptic number.

21151145519 is a deficient number, since it is larger than the sum of its proper divisors (3453248305).

21151145519 is an equidigital number, since it uses as much as digits as its factorization.

21151145519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431656045 (or 431656038 counting only the distinct ones).

The product of its digits is 9000, while the sum is 35.

The spelling of 21151145519 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-five thousand, five hundred nineteen".