21650152211 has 4 divisors (see below), whose sum is σ = 21663460632. Its totient is φ = 21636843792.

The previous prime is 21650152201. The next prime is 21650152253. The reversal of 21650152211 is 11225105612.

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-21650152211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21650152201) 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, 6651770 + ... + 6655023.

It is an arithmetic number, because the mean of its divisors is an integer number (5415865158).

Almost surely, 2^21650152211 is an apocalyptic number.

21650152211 is a deficient number, since it is larger than the sum of its proper divisors (13308421).

21650152211 is a wasteful number, since it uses less digits than its factorization.

21650152211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13308420.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21650152211 its reverse (11225105612), we get a palindrome (32875257823).

The spelling of 21650152211 in words is "twenty-one billion, six hundred fifty million, one hundred fifty-two thousand, two hundred eleven".