21213555613630 has 16 divisors (see below), whose sum is σ = 38184877621440. Its totient is φ = 8485316130592.

The previous prime is 21213555613603. The next prime is 21213555613651. The reversal of 21213555613630 is 3631655531212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12422185 + ... + 14026324.

It is an arithmetic number, because the mean of its divisors is an integer number (2386554851340).

Almost surely, 2^{21213555613630} is an apocalyptic number.

21213555613630 is a deficient number, since it is larger than the sum of its proper divisors (16971322007810).

21213555613630 is a wasteful number, since it uses less digits than its factorization.

21213555613630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26528723.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 21213555613630 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-five million, six hundred thirteen thousand, six hundred thirty".