21553132052111 has 12 divisors (see below), whose sum is σ = 24976954542840. Its totient is φ = 18441182501760.

The previous prime is 21553132052099. The next prime is 21553132052171. The reversal of 21553132052111 is 11125023135512.

It is not a de Polignac number, because 21553132052111 - 2¹⁴ = 21553132035727 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 (21553132052171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3389920076 + ... + 3389926433.

It is an arithmetic number, because the mean of its divisors is an integer number (2081412878570).

Almost surely, 2^{21553132052111} is an apocalyptic number.

21553132052111 is a deficient number, since it is larger than the sum of its proper divisors (3423822490729).

21553132052111 is a wasteful number, since it uses less digits than its factorization.

21553132052111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779846554 (or 6779846537 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 21553132052111 its reverse (11125023135512), we get a palindrome (32678155187623).

The spelling of 21553132052111 in words is "twenty-one trillion, five hundred fifty-three billion, one hundred thirty-two million, fifty-two thousand, one hundred eleven".