21043420115 has 8 divisors (see below), whose sum is σ = 25252931328. Its totient is φ = 16834184640.

The previous prime is 21043420103. The next prime is 21043420127. The reversal of 21043420115 is 51102434012.

It is an interprime number because it is at equal distance from previous prime (21043420103) and next prime (21043420127).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21043420115 - 2¹² = 21043416019 is a prime.

It is a super-2 number, since 2×21043420115² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182039 + ... + 274271.

It is an arithmetic number, because the mean of its divisors is an integer number (3156616416).

Almost surely, 2^21043420115 is an apocalyptic number.

21043420115 is a deficient number, since it is larger than the sum of its proper divisors (4209511213).

21043420115 is an equidigital number, since it uses as much as digits as its factorization.

21043420115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137869.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21043420115 its reverse (51102434012), we get a palindrome (72145854127).

The spelling of 21043420115 in words is "twenty-one billion, forty-three million, four hundred twenty thousand, one hundred fifteen".