21193980613 has 8 divisors (see below), whose sum is σ = 22826244056. Its totient is φ = 19561996800.

The previous prime is 21193980607. The next prime is 21193980617. The reversal of 21193980613 is 31608939112.

It can be written as a sum of positive squares in 4 ways, for example, as 5459288769 + 15734691844 = 73887^2 + 125438^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21193980613 - 2¹³ = 21193972421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21193980613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193980617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103453 + ... + 230413.

It is an arithmetic number, because the mean of its divisors is an integer number (2853280507).

Almost surely, 2^21193980613 is an apocalyptic number.

It is an amenable number.

21193980613 is a deficient number, since it is larger than the sum of its proper divisors (1632263443).

21193980613 is a wasteful number, since it uses less digits than its factorization.

21193980613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139815.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 21193980613 in words is "twenty-one billion, one hundred ninety-three million, nine hundred eighty thousand, six hundred thirteen".