21554114111 has 4 divisors (see below), whose sum is σ = 21558364632. Its totient is φ = 21549863592.

The previous prime is 21554114089. The next prime is 21554114123. The reversal of 21554114111 is 11141145512.

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 21554114111 - 2¹⁴ = 21554097727 is a prime.

It is a super-2 number, since 2×21554114111² (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 (21554114161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117645 + ... + 2127798.

It is an arithmetic number, because the mean of its divisors is an integer number (5389591158).

Almost surely, 2^21554114111 is an apocalyptic number.

21554114111 is a deficient number, since it is larger than the sum of its proper divisors (4250521).

21554114111 is an equidigital number, since it uses as much as digits as its factorization.

21554114111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250520.

The product of its digits is 800, while the sum is 26.

Adding to 21554114111 its reverse (11141145512), we get a palindrome (32695259623).

The spelling of 21554114111 in words is "twenty-one billion, five hundred fifty-four million, one hundred fourteen thousand, one hundred eleven".