21154422011 has 8 divisors (see below), whose sum is σ = 21178623984. Its totient is φ = 21130237440.

The previous prime is 21154422001. The next prime is 21154422013. The reversal of 21154422011 is 11022445112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21154422011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154422013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5575331 + ... + 5579123.

It is an arithmetic number, because the mean of its divisors is an integer number (2647327998).

Almost surely, 2^21154422011 is an apocalyptic number.

21154422011 is a deficient number, since it is larger than the sum of its proper divisors (24201973).

21154422011 is a wasteful number, since it uses less digits than its factorization.

21154422011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21154422011 its reverse (11022445112), we get a palindrome (32176867123).

The spelling of 21154422011 in words is "twenty-one billion, one hundred fifty-four million, four hundred twenty-two thousand, eleven".