21124221102 has 24 divisors (see below), whose sum is σ = 45934388136. Its totient is φ = 7015985136.

The previous prime is 21124221091. The next prime is 21124221121. The reversal of 21124221102 is 20112242112.

21124221102 is a `hidden beast` number, since 211 + 242 + 211 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2113368 + ... + 2123339.

It is an arithmetic number, because the mean of its divisors is an integer number (1913932839).

Almost surely, 2^21124221102 is an apocalyptic number.

21124221102 is an abundant number, since it is smaller than the sum of its proper divisors (24810167034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124221102 is a wasteful number, since it uses less digits than its factorization.

21124221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236992 (or 4236989 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21124221102 its reverse (20112242112), we get a palindrome (41236463214).

The spelling of 21124221102 in words is "twenty-one billion, one hundred twenty-four million, two hundred twenty-one thousand, one hundred two".