21013444319 has 8 divisors (see below), whose sum is σ = 24016339488. Its totient is φ = 18010792800.

The previous prime is 21013444313. The next prime is 21013444351. The reversal of 21013444319 is 91344431012.

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

It is not a de Polignac number, because 21013444319 - 2⁸ = 21013444063 is a prime.

It is a super-2 number, since 2×21013444319² (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 (21013444313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196349 + ... + 283865.

It is an arithmetic number, because the mean of its divisors is an integer number (3002042436).

Almost surely, 2^21013444319 is an apocalyptic number.

21013444319 is a deficient number, since it is larger than the sum of its proper divisors (3002895169).

21013444319 is an equidigital number, since it uses as much as digits as its factorization.

21013444319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121825.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21013444319 in words is "twenty-one billion, thirteen million, four hundred forty-four thousand, three hundred nineteen".