13019027859721 has 27 divisors (see below), whose sum is σ = 14152238521407. Its totient is φ = 11971105136640.

The previous prime is 13019027859697. The next prime is 13019027859731. The reversal of 13019027859721 is 12795872091031.

The square root of 13019027859721 is 3608189.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 10864532307321 + 2154495552400 = 3296139^2 + 1467820^2 .

It is not a de Polignac number, because 13019027859721 - 2¹¹ = 13019027857673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13019027859731) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20310495561 + ... + 20310496201.

Almost surely, 2^{13019027859721} is an apocalyptic number.

13019027859721 is the 3608189-th square number.

13019027859721 is the 1804095-th centered octagonal number.

It is an amenable number.

13019027859721 is a deficient number, since it is larger than the sum of its proper divisors (1133210661686).

13019027859721 is an frugal number, since it uses more digits than its factorization.

13019027859721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 55.

The spelling of 13019027859721 in words is "thirteen trillion, nineteen billion, twenty-seven million, eight hundred fifty-nine thousand, seven hundred twenty-one".