21213030132 has 144 divisors (see below), whose sum is σ = 62062640640. Its totient is φ = 5984165376.

The previous prime is 21213030131. The next prime is 21213030133. The reversal of 21213030132 is 23103031212.

It is an interprime number because it is at equal distance from previous prime (21213030131) and next prime (21213030133).

It is a super-2 number, since 2×21213030132² (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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213030131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6799669 + ... + 6802787.

It is an arithmetic number, because the mean of its divisors is an integer number (430990560).

Almost surely, 2^21213030132 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 21213030132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31031320320).

21213030132 is an abundant number, since it is smaller than the sum of its proper divisors (40849610508).

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

21213030132 is a wasteful number, since it uses less digits than its factorization.

21213030132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3465 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21213030132 its reverse (23103031212), we get a palindrome (44316061344).

The spelling of 21213030132 in words is "twenty-one billion, two hundred thirteen million, thirty thousand, one hundred thirty-two".