21112505411 has 4 divisors (see below), whose sum is σ = 22354417512. Its totient is φ = 19870593312.

The previous prime is 21112505369. The next prime is 21112505417. The reversal of 21112505411 is 11450521112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112505411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112505417) 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, 620956025 + ... + 620956058.

It is an arithmetic number, because the mean of its divisors is an integer number (5588604378).

Almost surely, 2^21112505411 is an apocalyptic number.

21112505411 is a deficient number, since it is larger than the sum of its proper divisors (1241912101).

21112505411 is a wasteful number, since it uses less digits than its factorization.

21112505411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241912100.

The product of its (nonzero) digits is 400, while the sum is 23.

The spelling of 21112505411 in words is "twenty-one billion, one hundred twelve million, five hundred five thousand, four hundred eleven".