20111220212002 has 16 divisors (see below), whose sum is σ = 31208722300800. Its totient is φ = 9708349588560.

The previous prime is 20111220211993. The next prime is 20111220212051. The reversal of 20111220212002 is 20021202211102.

It is a happy number.

It is a super-2 number, since 2×20111220212002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8099274 + ... + 10286917.

It is an arithmetic number, because the mean of its divisors is an integer number (1950545143800).

Almost surely, 2^{20111220212002} is an apocalyptic number.

20111220212002 is a deficient number, since it is larger than the sum of its proper divisors (11097502088798).

20111220212002 is a wasteful number, since it uses less digits than its factorization.

20111220212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18405081.

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

Adding to 20111220212002 its reverse (20021202211102), we get a palindrome (40132422423104).

Subtracting from 20111220212002 its reverse (20021202211102), we obtain a square (90018000900 = 300030²).

The spelling of 20111220212002 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, two hundred twelve thousand, two".