21130221132 has 72 divisors (see below), whose sum is σ = 54382167840. Its totient is φ = 6916389120.

The previous prime is 21130221121. The next prime is 21130221137. The reversal of 21130221132 is 23112203112.

21130221132 is a `hidden beast` number, since 211 + 302 + 21 + 132 = 666.

It is a super-2 number, since 2×21130221132² (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 not an unprimeable number, because it can be changed into a prime (21130221137) 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 23 ways as a sum of consecutive naturals, for example, 584257 + ... + 619367.

Almost surely, 2^21130221132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130221132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27191083920).

21130221132 is an abundant number, since it is smaller than the sum of its proper divisors (33251946708).

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

21130221132 is a wasteful number, since it uses less digits than its factorization.

21130221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35423 (or 35418 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21130221132 its reverse (23112203112), we get a palindrome (44242424244).

The spelling of 21130221132 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-one thousand, one hundred thirty-two".