21210000010212 has 48 divisors (see below), whose sum is σ = 53470528836032. Its totient is φ = 6504896004480.

The previous prime is 21210000010181. The next prime is 21210000010217. The reversal of 21210000010212 is 21201000001212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21210000010217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221387839 + ... + 221483622.

Almost surely, 2^{21210000010212} is an apocalyptic number.

It is an amenable number.

21210000010212 is an abundant number, since it is smaller than the sum of its proper divisors (32260528825820).

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

21210000010212 is a wasteful number, since it uses less digits than its factorization.

21210000010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442871788 (or 442871786 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210000010212 its reverse (21201000001212), we get a palindrome (42411000011424).

The spelling of 21210000010212 in words is "twenty-one trillion, two hundred ten billion, ten thousand, two hundred twelve".