21112221132 has 48 divisors (see below), whose sum is σ = 54743522400. Its totient is φ = 7036361280.

The previous prime is 21112221131. The next prime is 21112221133. The reversal of 21112221132 is 23112221112.

It is an interprime number because it is at equal distance from previous prime (21112221131) and next prime (21112221133).

It is a super-2 number, since 2×21112221132² (a number of 21 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21112221131) 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 15 ways as a sum of consecutive naturals, for example, 1134382 + ... + 1152842.

It is an arithmetic number, because the mean of its divisors is an integer number (1140490050).

Almost surely, 2^21112221132 is an apocalyptic number.

It is an amenable number.

21112221132 is an abundant number, since it is smaller than the sum of its proper divisors (33631301268).

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

21112221132 is a wasteful number, since it uses less digits than its factorization.

21112221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29063 (or 29055 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21112221132 its reverse (23112221112), we get a palindrome (44224442244).

The spelling of 21112221132 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, one hundred thirty-two".