21301021212 has 36 divisors (see below), whose sum is σ = 51082035480. Its totient is φ = 6908433984.

The previous prime is 21301021171. The next prime is 21301021283. The reversal of 21301021212 is 21212010312.

It is a junction number, because it is equal to n+sod(n) for n = 21301021191 and 21301021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631887 + ... + 664742.

It is an arithmetic number, because the mean of its divisors is an integer number (1418945430).

Almost surely, 2^21301021212 is an apocalyptic number.

It is an amenable number.

21301021212 is an abundant number, since it is smaller than the sum of its proper divisors (29781014268).

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

21301021212 is a wasteful number, since it uses less digits than its factorization.

21301021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296710 (or 1296671 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21301021212 its reverse (21212010312), we get a palindrome (42513031524).

The spelling of 21301021212 in words is "twenty-one billion, three hundred one million, twenty-one thousand, two hundred twelve".