21023132130 has 192 divisors, whose sum is σ = 73390157568. Its totient is φ = 4032391680.

The previous prime is 21023132113. The next prime is 21023132131. The reversal of 21023132130 is 3123132012.

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 (21023132131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 26589 + ... + 206768.

It is an arithmetic number, because the mean of its divisors is an integer number (382240404).

Almost surely, 2^21023132130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023132130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36695078784).

21023132130 is an abundant number, since it is smaller than the sum of its proper divisors (52367025438).

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

21023132130 is a wasteful number, since it uses less digits than its factorization.

21023132130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233401 (or 233398 counting only the distinct ones).

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

Adding to 21023132130 its reverse (3123132012), we get a palindrome (24146264142).

The spelling of 21023132130 in words is "twenty-one billion, twenty-three million, one hundred thirty-two thousand, one hundred thirty".