21213130302 has 192 divisors, whose sum is σ = 59521198464. Its totient is φ = 5310074880.

The previous prime is 21213130277. The next prime is 21213130361. The reversal of 21213130302 is 20303131212.

21213130302 is a `hidden beast` number, since 21 + 213 + 130 + 302 = 666.

It is a super-2 number, since 2×21213130302² (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 an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 2480578 + ... + 2489114.

It is an arithmetic number, because the mean of its divisors is an integer number (310006242).

Almost surely, 2^21213130302 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213130302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29760599232).

21213130302 is an abundant number, since it is smaller than the sum of its proper divisors (38308068162).

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

21213130302 is a wasteful number, since it uses less digits than its factorization.

21213130302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8643 (or 8640 counting only the distinct ones).

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

Adding to 21213130302 its reverse (20303131212), we get a palindrome (41516261514).

The spelling of 21213130302 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty thousand, three hundred two".