21609827411 has 4 divisors (see below), whose sum is σ = 21611319432. Its totient is φ = 21608335392.

The previous prime is 21609827377. The next prime is 21609827413. The reversal of 21609827411 is 11472890612.

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

It is a cyclic number.

It is not a de Polignac number, because 21609827411 - 2³⁰ = 20536085587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21609827413) 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, 724070 + ... + 753323.

It is an arithmetic number, because the mean of its divisors is an integer number (5402829858).

Almost surely, 2^21609827411 is an apocalyptic number.

21609827411 is a deficient number, since it is larger than the sum of its proper divisors (1492021).

21609827411 is a wasteful number, since it uses less digits than its factorization.

21609827411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492020.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 21609827411 in words is "twenty-one billion, six hundred nine million, eight hundred twenty-seven thousand, four hundred eleven".