21111212202212 has 48 divisors (see below), whose sum is σ = 40926292303680. Its totient is φ = 9447806544000.

The previous prime is 21111212202137. The next prime is 21111212202221. The reversal of 21111212202212 is 21220221211112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3720614 + ... + 7487682.

It is an arithmetic number, because the mean of its divisors is an integer number (852631089660).

Almost surely, 2^{21111212202212} is an apocalyptic number.

21111212202212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111212202212 is a deficient number, since it is larger than the sum of its proper divisors (19815080101468).

21111212202212 is a wasteful number, since it uses less digits than its factorization.

21111212202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769052 (or 3769050 counting only the distinct ones).

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

Adding to 21111212202212 its reverse (21220221211112), we get a palindrome (42331433413324).

The spelling of 21111212202212 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, two hundred two thousand, two hundred twelve".