1021123111212 has 18 divisors (see below), whose sum is σ = 2581172308988. Its totient is φ = 340374370392.

The previous prime is 1021123111157. The next prime is 1021123111223. The reversal of 1021123111212 is 2121113211201.

It is a happy number.

1021123111212 is a `hidden beast` number, since 1 + 0 + 211 + 231 + 11 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 14182265398 + ... + 14182265469.

Almost surely, 2^{1021123111212} is an apocalyptic number.

1021123111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021123111212 is an abundant number, since it is smaller than the sum of its proper divisors (1560049197776).

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

1021123111212 is a wasteful number, since it uses less digits than its factorization.

1021123111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28364530877 (or 28364530872 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1021123111212 its reverse (2121113211201), we get a palindrome (3142236322413).

The spelling of 1021123111212 in words is "one trillion, twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, two hundred twelve".