12021121012 has 12 divisors (see below), whose sum is σ = 21433885956. Its totient is φ = 5897153600.

The previous prime is 12021120997. The next prime is 12021121019. The reversal of 12021121012 is 21012112021.

It can be written as a sum of positive squares in 2 ways, for example, as 5792123236 + 6228997776 = 76106^2 + 78924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12021120983 and 12021121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021121019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28351489 + ... + 28351912.

It is an arithmetic number, because the mean of its divisors is an integer number (1786157163).

Almost surely, 2^12021121012 is an apocalyptic number.

It is an amenable number.

12021121012 is a deficient number, since it is larger than the sum of its proper divisors (9412764944).

12021121012 is a wasteful number, since it uses less digits than its factorization.

12021121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56703458 (or 56703456 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12021121012 its reverse (21012112021), we get a palindrome (33033233033).

The spelling of 12021121012 in words is "twelve billion, twenty-one million, one hundred twenty-one thousand, twelve".