21213152300 has 72 divisors (see below), whose sum is σ = 48546267840. Its totient is φ = 8023579200.

The previous prime is 21213152297. The next prime is 21213152351. The reversal of 21213152300 is 325131212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1029095 + ... + 1049505.

It is an arithmetic number, because the mean of its divisors is an integer number (674253720).

Almost surely, 2^21213152300 is an apocalyptic number.

21213152300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213152300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24273133920).

21213152300 is an abundant number, since it is smaller than the sum of its proper divisors (27333115540).

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

21213152300 is a wasteful number, since it uses less digits than its factorization.

21213152300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20991 (or 20984 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21213152300 its reverse (325131212), we get a palindrome (21538283512).

The spelling of 21213152300 in words is "twenty-one billion, two hundred thirteen million, one hundred fifty-two thousand, three hundred".