21012211212 has 48 divisors (see below), whose sum is σ = 49279426560. Its totient is φ = 6968274048.

The previous prime is 21012211201. The next prime is 21012211243. The reversal of 21012211212 is 21211221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012211191 and 21012211200.

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, 4647489 + ... + 4652007.

It is an arithmetic number, because the mean of its divisors is an integer number (1026654720).

Almost surely, 2^21012211212 is an apocalyptic number.

It is an amenable number.

21012211212 is an abundant number, since it is smaller than the sum of its proper divisors (28267215348).

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

21012211212 is a wasteful number, since it uses less digits than its factorization.

21012211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422 (or 6420 counting only the distinct ones).

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

Adding to 21012211212 its reverse (21211221012), we get a palindrome (42223432224).

The spelling of 21012211212 in words is "twenty-one billion, twelve million, two hundred eleven thousand, two hundred twelve".