1221020040012 has 72 divisors (see below), whose sum is σ = 3088424563056. Its totient is φ = 374156504064.

The previous prime is 1221020040011. The next prime is 1221020040043. The reversal of 1221020040012 is 2100400201221.

It is a super-2 number, since 2×1221020040012² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221020039973 and 1221020040000.

It is not an unprimeable number, because it can be changed into a prime (1221020040011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1241353 + ... + 1995744.

It is an arithmetic number, because the mean of its divisors is an integer number (42894785598).

Almost surely, 2^{1221020040012} is an apocalyptic number.

1221020040012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221020040012 is an abundant number, since it is smaller than the sum of its proper divisors (1867404523044).

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

1221020040012 is a wasteful number, since it uses less digits than its factorization.

1221020040012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237207 (or 3237162 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221020040012 its reverse (2100400201221), we get a palindrome (3321420241233).

The spelling of 1221020040012 in words is "one trillion, two hundred twenty-one billion, twenty million, forty thousand, twelve".