2019698587921 has 9 divisors (see below), whose sum is σ = 2349456868521. Its totient is φ = 1731161691252.

The previous prime is 2019698587891. The next prime is 2019698587961. The reversal of 2019698587921 is 1297858969102.

The square root of 2019698587921 is 1421161.

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

It is not a de Polignac number, because 2019698587921 - 2⁵ = 2019698587889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2019698587961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9846616 + ... + 10049638.

It is an arithmetic number, because the mean of its divisors is an integer number (261050763169).

Almost surely, 2^{2019698587921} is an apocalyptic number.

2019698587921 is the 1421161-st square number.

2019698587921 is the 710581-st centered octagonal number.

It is an amenable number.

2019698587921 is a deficient number, since it is larger than the sum of its proper divisors (329758280600).

2019698587921 is an frugal number, since it uses more digits than its factorization.

2019698587921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406060 (or 203030 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 67.

The spelling of 2019698587921 in words is "two trillion, nineteen billion, six hundred ninety-eight million, five hundred eighty-seven thousand, nine hundred twenty-one".