21398288019 has 8 divisors (see below), whose sum is σ = 28544888832. Its totient is φ = 14258606280.

The previous prime is 21398287961. The next prime is 21398288047. The reversal of 21398288019 is 91088289312.

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

It is not a de Polignac number, because 21398288019 - 2⁷ = 21398287891 is a prime.

It is a super-2 number, since 2×21398288019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21398288089) 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, 1722547 + ... + 1734924.

It is an arithmetic number, because the mean of its divisors is an integer number (3568111104).

Almost surely, 2^21398288019 is an apocalyptic number.

21398288019 is a deficient number, since it is larger than the sum of its proper divisors (7146600813).

21398288019 is a wasteful number, since it uses less digits than its factorization.

21398288019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459537.

The product of its (nonzero) digits is 497664, while the sum is 51.

The spelling of 21398288019 in words is "twenty-one billion, three hundred ninety-eight million, two hundred eighty-eight thousand, nineteen".