21012022212 has 24 divisors (see below), whose sum is σ = 49125537216. Its totient is φ = 6990080928.

The previous prime is 21012022201. The next prime is 21012022243. The reversal of 21012022212 is 21222021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012022191 and 21012022200.

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, 1734523 + ... + 1746594.

It is an arithmetic number, because the mean of its divisors is an integer number (2046897384).

Almost surely, 2^21012022212 is an apocalyptic number.

It is an amenable number.

21012022212 is an abundant number, since it is smaller than the sum of its proper divisors (28113515004).

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

21012022212 is a wasteful number, since it uses less digits than its factorization.

21012022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481627 (or 3481625 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012022212 its reverse (21222021012), we get a palindrome (42234043224).

The spelling of 21012022212 in words is "twenty-one billion, twelve million, twenty-two thousand, two hundred twelve".