21213354654330 has 64 divisors (see below), whose sum is σ = 51887494512000. Its totient is φ = 5548573046016.

The previous prime is 21213354654311. The next prime is 21213354654337. The reversal of 21213354654330 is 3345645331212.

It is not an unprimeable number, because it can be changed into a prime (21213354654337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3656904 + ... + 7469916.

It is an arithmetic number, because the mean of its divisors is an integer number (810742101750).

Almost surely, 2^{21213354654330} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213354654330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25943747256000).

21213354654330 is an abundant number, since it is smaller than the sum of its proper divisors (30674139857670).

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

21213354654330 is a wasteful number, since it uses less digits than its factorization.

21213354654330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816575.

The product of its (nonzero) digits is 777600, while the sum is 42.

Adding to 21213354654330 its reverse (3345645331212), we get a palindrome (24558999985542).

The spelling of 21213354654330 in words is "twenty-one trillion, two hundred thirteen billion, three hundred fifty-four million, six hundred fifty-four thousand, three hundred thirty".