21515466043 has 8 divisors (see below), whose sum is σ = 21824605440. Its totient is φ = 21206496360.

The previous prime is 21515466023. The next prime is 21515466061. The reversal of 21515466043 is 34066451512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21515466043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21515465993 and 21515466011.

It is not an unprimeable number, because it can be changed into a prime (21515466023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224946 + ... + 305992.

It is an arithmetic number, because the mean of its divisors is an integer number (2728075680).

Almost surely, 2^21515466043 is an apocalyptic number.

21515466043 is a deficient number, since it is larger than the sum of its proper divisors (309139397).

21515466043 is an equidigital number, since it uses as much as digits as its factorization.

21515466043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84857.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21515466043 in words is "twenty-one billion, five hundred fifteen million, four hundred sixty-six thousand, forty-three".