19712667321 has 24 divisors (see below), whose sum is σ = 29560644360. Its totient is φ = 12643411200.

The previous prime is 19712667319. The next prime is 19712667323. The reversal of 19712667321 is 12376621791.

It is an interprime number because it is at equal distance from previous prime (19712667319) and next prime (19712667323).

It can be written as a sum of positive squares in 4 ways, for example, as 2300545296 + 17412122025 = 47964^2 + 131955^2 .

It is not a de Polignac number, because 19712667321 - 2¹ = 19712667319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19712667323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61050 + ... + 207731.

It is an arithmetic number, because the mean of its divisors is an integer number (1231693515).

Almost surely, 2^19712667321 is an apocalyptic number.

It is an amenable number.

19712667321 is a deficient number, since it is larger than the sum of its proper divisors (9847977039).

19712667321 is a wasteful number, since it uses less digits than its factorization.

19712667321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269097 (or 269094 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 19712667321 in words is "nineteen billion, seven hundred twelve million, six hundred sixty-seven thousand, three hundred twenty-one".