11221021212 has 24 divisors (see below), whose sum is σ = 26243142912. Its totient is φ = 3731660400.

The previous prime is 11221021111. The next prime is 11221021219. The reversal of 11221021212 is 21212012211.

It is a super-2 number, since 2×11221021212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11221021191 and 11221021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221021219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079614 + ... + 1089957.

It is an arithmetic number, because the mean of its divisors is an integer number (1093464288).

Almost surely, 2^11221021212 is an apocalyptic number.

11221021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221021212 is an abundant number, since it is smaller than the sum of its proper divisors (15022121700).

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

11221021212 is a wasteful number, since it uses less digits than its factorization.

11221021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170009 (or 2170007 counting only the distinct ones).

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

Adding to 11221021212 its reverse (21212012211), we get a palindrome (32433033423).

Subtracting 11221021212 from its reverse (21212012211), we obtain a palindrome (9990990999).

The spelling of 11221021212 in words is "eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twelve".