10111212211212 has 144 divisors (see below), whose sum is σ = 31618934699520. Its totient is φ = 2736869396832.

The previous prime is 10111212211201. The next prime is 10111212211277. The reversal of 10111212211212 is 21211221211101.

It is a happy number.

It is a super-2 number, since 2×10111212211212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18251488 + ... + 18797319.

Almost surely, 2^{10111212211212} is an apocalyptic number.

10111212211212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

10111212211212 is an abundant number, since it is smaller than the sum of its proper divisors (21507722488308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10111212211212 is a wasteful number, since it uses less digits than its factorization.

10111212211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37048865 (or 37048838 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 10111212211212 its reverse (21211221211101), we get a palindrome (31322433422313).

The spelling of 10111212211212 in words is "ten trillion, one hundred eleven billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".