21910344013 has 4 divisors (see below), whose sum is σ = 22025058048. Its totient is φ = 21795629980.

The previous prime is 21910344011. The next prime is 21910344047. The reversal of 21910344013 is 31044301912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21910344013 - 2¹ = 21910344011 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 (21910344011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57356731 + ... + 57357112.

It is an arithmetic number, because the mean of its divisors is an integer number (5506264512).

Almost surely, 2^21910344013 is an apocalyptic number.

It is an amenable number.

21910344013 is a deficient number, since it is larger than the sum of its proper divisors (114714035).

21910344013 is a wasteful number, since it uses less digits than its factorization.

21910344013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114714034.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 21910344013 its reverse (31044301912), we get a palindrome (52954645925).

The spelling of 21910344013 in words is "twenty-one billion, nine hundred ten million, three hundred forty-four thousand, thirteen".