21312300111212 has 48 divisors (see below), whose sum is σ = 40747225989120. Its totient is φ = 9673108387200.

The previous prime is 21312300111203. The next prime is 21312300111217. The reversal of 21312300111212 is 21211100321312.

It is not an unprimeable number, because it can be changed into a prime (21312300111217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81300512 + ... + 81562232.

It is an arithmetic number, because the mean of its divisors is an integer number (848900541440).

Almost surely, 2^{21312300111212} is an apocalyptic number.

21312300111212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21312300111212 is a deficient number, since it is larger than the sum of its proper divisors (19434925877908).

21312300111212 is a wasteful number, since it uses less digits than its factorization.

21312300111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264462 (or 264460 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21312300111212 its reverse (21211100321312), we get a palindrome (42523400432524).

The spelling of 21312300111212 in words is "twenty-one trillion, three hundred twelve billion, three hundred million, one hundred eleven thousand, two hundred twelve".