21102110111212 has 48 divisors (see below), whose sum is σ = 40618530029952. Its totient is φ = 9531506499840.

The previous prime is 21102110111207. The next prime is 21102110111233. The reversal of 21102110111212 is 21211101120112.

It is a super-2 number, since 2×21102110111212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33367498 + ... + 33994030.

It is an arithmetic number, because the mean of its divisors is an integer number (846219375624).

Almost surely, 2^{21102110111212} is an apocalyptic number.

It is an amenable number.

21102110111212 is a deficient number, since it is larger than the sum of its proper divisors (19516419918740).

21102110111212 is a wasteful number, since it uses less digits than its factorization.

21102110111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640378 (or 640376 counting only the distinct ones).

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

Adding to 21102110111212 its reverse (21211101120112), we get a palindrome (42313211231324).

The spelling of 21102110111212 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, one hundred eleven thousand, two hundred twelve".