1212021121110 has 32 divisors (see below), whose sum is σ = 2913565241952. Its totient is φ = 322681793280.

The previous prime is 1212021121049. The next prime is 1212021121117. The reversal of 1212021121110 is 111211202121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1212021121110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021121117) 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, 32721121 + ... + 32758140.

It is an arithmetic number, because the mean of its divisors is an integer number (91048913811).

Almost surely, 2^{1212021121110} is an apocalyptic number.

1212021121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212021121110 is an abundant number, since it is smaller than the sum of its proper divisors (1701544120842).

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

1212021121110 is a wasteful number, since it uses less digits than its factorization.

1212021121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65479888.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212021121110 its reverse (111211202121), we get a palindrome (1323232323231).

The spelling of 1212021121110 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, one hundred ten".