21210021010212 has 48 divisors (see below), whose sum is σ = 49675612089600. Its totient is φ = 7043499673600.

The previous prime is 21210021010183. The next prime is 21210021010249. The reversal of 21210021010212 is 21201012001212.

It is a junction number, because it is equal to n+sod(n) for n = 21210021010191 and 21210021010200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123711364 + ... + 123882692.

It is an arithmetic number, because the mean of its divisors is an integer number (1034908585200).

Almost surely, 2^{21210021010212} is an apocalyptic number.

It is an amenable number.

21210021010212 is an abundant number, since it is smaller than the sum of its proper divisors (28465591079388).

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

21210021010212 is a wasteful number, since it uses less digits than its factorization.

21210021010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209956 (or 209954 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210021010212 its reverse (21201012001212), we get a palindrome (42411033011424).

The spelling of 21210021010212 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, ten thousand, two hundred twelve".