21211010212 has 24 divisors (see below), whose sum is σ = 42434569856. Its totient is φ = 9087743808.

The previous prime is 21211010207. The next prime is 21211010243. The reversal of 21211010212 is 21201011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211010192 and 21211010201.

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, 14208 + ... + 206455.

Almost surely, 2^21211010212 is an apocalyptic number.

It is an amenable number.

21211010212 is an abundant number, since it is smaller than the sum of its proper divisors (21223559644).

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

21211010212 is a wasteful number, since it uses less digits than its factorization.

21211010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224107 (or 224105 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211010212 its reverse (21201011212), we get a palindrome (42412021424).

The spelling of 21211010212 in words is "twenty-one billion, two hundred eleven million, ten thousand, two hundred twelve".