21112221012212 has 24 divisors (see below), whose sum is σ = 40426917055392. Its totient is φ = 9567471751200.

The previous prime is 21112221012173. The next prime is 21112221012217. The reversal of 21112221012212 is 21221012221112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112221012217) 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, 724793903 + ... + 724823030.

It is an arithmetic number, because the mean of its divisors is an integer number (1684454877308).

Almost surely, 2^{21112221012212} is an apocalyptic number.

21112221012212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112221012212 is a deficient number, since it is larger than the sum of its proper divisors (19314696043180).

21112221012212 is a wasteful number, since it uses less digits than its factorization.

21112221012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449617279 (or 1449617277 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112221012212 its reverse (21221012221112), we get a palindrome (42333233233324).

The spelling of 21112221012212 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, twelve thousand, two hundred twelve".