21154050111 has 8 divisors (see below), whose sum is σ = 28206868144. Its totient is φ = 14101966080.

The previous prime is 21154050089. The next prime is 21154050119. The reversal of 21154050111 is 11105045112.

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

It is not a de Polignac number, because 21154050111 - 2²² = 21149855807 is a prime.

It is a super-2 number, since 2×21154050111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154050119) 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, 112306 + ... + 234351.

It is an arithmetic number, because the mean of its divisors is an integer number (3525858518).

Almost surely, 2^21154050111 is an apocalyptic number.

21154050111 is a deficient number, since it is larger than the sum of its proper divisors (7052818033).

21154050111 is a wasteful number, since it uses less digits than its factorization.

21154050111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367001.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21154050111 its reverse (11105045112), we get a palindrome (32259095223).

The spelling of 21154050111 in words is "twenty-one billion, one hundred fifty-four million, fifty thousand, one hundred eleven".