21021120010212 has 144 divisors (see below), whose sum is σ = 57621194503488. Its totient is φ = 5946739411200.

The previous prime is 21021120010199. The next prime is 21021120010243. The reversal of 21021120010212 is 21201002112012.

It is a junction number, because it is equal to n+sod(n) for n = 21021120010191 and 21021120010200.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119515438 + ... + 119691194.

It is an arithmetic number, because the mean of its divisors is an integer number (400147184052).

Almost surely, 2^{21021120010212} 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 21021120010212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28810597251744).

21021120010212 is an abundant number, since it is smaller than the sum of its proper divisors (36600074493276).

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

21021120010212 is a wasteful number, since it uses less digits than its factorization.

21021120010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177786 (or 177777 counting only the distinct ones).

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

Adding to 21021120010212 its reverse (21201002112012), we get a palindrome (42222122122224).

The spelling of 21021120010212 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, ten thousand, two hundred twelve".