20121220121002 has 64 divisors (see below), whose sum is σ = 40524992944128. Its totient is φ = 7236199800000.

The previous prime is 20121220120987. The next prime is 20121220121069. The reversal of 20121220121002 is 20012102212102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83665627 + ... + 83905777.

It is an arithmetic number, because the mean of its divisors is an integer number (633203014752).

Almost surely, 2^{20121220121002} is an apocalyptic number.

20121220121002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20121220121002 is an abundant number, since it is smaller than the sum of its proper divisors (20403772823126).

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

20121220121002 is a wasteful number, since it uses less digits than its factorization.

20121220121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282035.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20121220121002 its reverse (20012102212102), we get a palindrome (40133322333104).

Subtracting from 20121220121002 its reverse (20012102212102), we obtain a square (109117908900 = 330330²).

The spelling of 20121220121002 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two".