21213600205630 has 16 divisors (see below), whose sum is σ = 43639406137440. Its totient is φ = 7273234356192.

The previous prime is 21213600205613. The next prime is 21213600205631. The reversal of 21213600205630 is 3650200631212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21213600205592 and 21213600205601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213600205631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151525715685 + ... + 151525715824.

It is an arithmetic number, because the mean of its divisors is an integer number (2727462883590).

Almost surely, 2^{21213600205630} is an apocalyptic number.

21213600205630 is an abundant number, since it is smaller than the sum of its proper divisors (22425805931810).

21213600205630 is a wasteful number, since it uses less digits than its factorization.

21213600205630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303051431523.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 21213600205630 its reverse (3650200631212), we get a palindrome (24863800836842).

The spelling of 21213600205630 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, two hundred five thousand, six hundred thirty".