21213612324356 has 12 divisors (see below), whose sum is σ = 37677908457168. Its totient is φ = 10448495622312.

The previous prime is 21213612324341. The next prime is 21213612324383. The reversal of 21213612324356 is 65342321631212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39577634666 + ... + 39577635201.

It is an arithmetic number, because the mean of its divisors is an integer number (3139825704764).

Almost surely, 2^{21213612324356} is an apocalyptic number.

It is an amenable number.

21213612324356 is a deficient number, since it is larger than the sum of its proper divisors (16464296132812).

21213612324356 is a wasteful number, since it uses less digits than its factorization.

21213612324356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79155269938 (or 79155269936 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

Adding to 21213612324356 its reverse (65342321631212), we get a palindrome (86555933955568).

The spelling of 21213612324356 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred twenty-four thousand, three hundred fifty-six".