21111020120212 has 48 divisors (see below), whose sum is σ = 41329592023104. Its totient is φ = 9352425600000.

The previous prime is 21111020120159. The next prime is 21111020120219. The reversal of 21111020120212 is 21202102011112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111020120219) 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, 11229789 + ... + 12974212.

It is an arithmetic number, because the mean of its divisors is an integer number (861033167148).

Almost surely, 2^{21111020120212} is an apocalyptic number.

21111020120212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111020120212 is a deficient number, since it is larger than the sum of its proper divisors (20218571902892).

21111020120212 is a wasteful number, since it uses less digits than its factorization.

21111020120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24204520 (or 24204518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21111020120212 its reverse (21202102011112), we get a palindrome (42313122131324).

The spelling of 21111020120212 in words is "twenty-one trillion, one hundred eleven billion, twenty million, one hundred twenty thousand, two hundred twelve".