21213988006212 has 144 divisors (see below), whose sum is σ = 55436495994880. Its totient is φ = 6835817790144.

The previous prime is 21213988006207. The next prime is 21213988006231. The reversal of 21213988006212 is 21260088931212.

21213988006212 is a `hidden beast` number, since 2 + 1 + 2 + 13 + 9 + 8 + 8 + 0 + 0 + 621 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 278510589 + ... + 278586747.

Almost surely, 2^{21213988006212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213988006212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27718247997440).

21213988006212 is an abundant number, since it is smaller than the sum of its proper divisors (34222507988668).

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

21213988006212 is a wasteful number, since it uses less digits than its factorization.

21213988006212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78062 (or 78057 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 21213988006212 in words is "twenty-one trillion, two hundred thirteen billion, nine hundred eighty-eight million, six thousand, two hundred twelve".