102021211111212 has 72 divisors (see below), whose sum is σ = 263512459933632. Its totient is φ = 33266006208000.

The previous prime is 102021211111151. The next prime is 102021211111213. The reversal of 102021211111212 is 212111112120201.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (102021211111213) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12642589 + ... + 19075572.

It is an arithmetic number, because the mean of its divisors is an integer number (3659895276856).

Almost surely, 2^{102021211111212} is an apocalyptic number.

102021211111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

102021211111212 is an abundant number, since it is smaller than the sum of its proper divisors (161491248822420).

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

102021211111212 is a wasteful number, since it uses less digits than its factorization.

102021211111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31720119 (or 31720114 counting only the distinct ones).

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

Adding to 102021211111212 its reverse (212111112120201), we get a palindrome (314132323231413).

The spelling of 102021211111212 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred twelve".