21371845611 has 8 divisors (see below), whose sum is σ = 28512339520. Its totient is φ = 14239624392.

The previous prime is 21371845609. The next prime is 21371845619. The reversal of 21371845611 is 11654817312.

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

It is not a de Polignac number, because 21371845611 - 2¹ = 21371845609 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 21371845611.

It is not an unprimeable number, because it can be changed into a prime (21371845619) 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, 2062141 + ... + 2072478.

It is an arithmetic number, because the mean of its divisors is an integer number (3564042440).

Almost surely, 2^21371845611 is an apocalyptic number.

21371845611 is a deficient number, since it is larger than the sum of its proper divisors (7140493909).

21371845611 is a wasteful number, since it uses less digits than its factorization.

21371845611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4136345.

The product of its digits is 40320, while the sum is 39.

The spelling of 21371845611 in words is "twenty-one billion, three hundred seventy-one million, eight hundred forty-five thousand, six hundred eleven".