11721430213 has 8 divisors (see below), whose sum is σ = 11834180600. Its totient is φ = 11608774848.

The previous prime is 11721430211. The next prime is 11721430219. The reversal of 11721430213 is 31203412711.

It can be written as a sum of positive squares in 4 ways, for example, as 19166884 + 11702263329 = 4378^2 + 108177^2 .

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 11721430213 - 2¹ = 11721430211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721430211) 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, 237895 + ... + 282907.

It is an arithmetic number, because the mean of its divisors is an integer number (1479272575).

Almost surely, 2^11721430213 is an apocalyptic number.

It is an amenable number.

11721430213 is a deficient number, since it is larger than the sum of its proper divisors (112750387).

11721430213 is a wasteful number, since it uses less digits than its factorization.

11721430213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47511.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 11721430213 its reverse (31203412711), we get a palindrome (42924842924).

The spelling of 11721430213 in words is "eleven billion, seven hundred twenty-one million, four hundred thirty thousand, two hundred thirteen".