21111221100132 has 18 divisors (see below), whose sum is σ = 53364475558758. Its totient is φ = 7037073700032.

The previous prime is 21111221100127. The next prime is 21111221100169. The reversal of 21111221100132 is 23100112211112.

It is a happy number.

21111221100132 is a `hidden beast` number, since 211 + 1 + 1 + 221 + 100 + 132 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20032481286756 + 1078739813376 = 4475766^2 + 1038624^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293211404133 + ... + 293211404204.

Almost surely, 2^{21111221100132} is an apocalyptic number.

It is an amenable number.

21111221100132 is an abundant number, since it is smaller than the sum of its proper divisors (32253254458626).

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

21111221100132 is a wasteful number, since it uses less digits than its factorization.

21111221100132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586422808347 (or 586422808342 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21111221100132 its reverse (23100112211112), we get a palindrome (44211333311244).

The spelling of 21111221100132 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred thousand, one hundred thirty-two".