21554252311 has 16 divisors (see below), whose sum is σ = 22578812928. Its totient is φ = 20554603200.

The previous prime is 21554252299. The next prime is 21554252387. The reversal of 21554252311 is 11325245512.

It is a cyclic number.

It is not a de Polignac number, because 21554252311 - 2⁷ = 21554252183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554252611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1579126 + ... + 1592716.

It is an arithmetic number, because the mean of its divisors is an integer number (1411175808).

Almost surely, 2^21554252311 is an apocalyptic number.

21554252311 is a deficient number, since it is larger than the sum of its proper divisors (1024560617).

21554252311 is a wasteful number, since it uses less digits than its factorization.

21554252311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14502.

The product of its digits is 12000, while the sum is 31.

Adding to 21554252311 its reverse (11325245512), we get a palindrome (32879497823).

The spelling of 21554252311 in words is "twenty-one billion, five hundred fifty-four million, two hundred fifty-two thousand, three hundred eleven".