20111220202120 has 64 divisors (see below), whose sum is σ = 45502031232000. Its totient is φ = 7999809938688.

The previous prime is 20111220202103. The next prime is 20111220202123. The reversal of 20111220202120 is 2120202211102.

It is a happy number.

It is a super-2 number, since 2×20111220202120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111220202094 and 20111220202103.

It is not an unprimeable number, because it can be changed into a prime (20111220202123) 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, 6376809 + ... + 8993671.

It is an arithmetic number, because the mean of its divisors is an integer number (710969238000).

Almost surely, 2^{20111220202120} is an apocalyptic number.

20111220202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111220202120 is an abundant number, since it is smaller than the sum of its proper divisors (25390811029880).

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

20111220202120 is a wasteful number, since it uses less digits than its factorization.

20111220202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617942 (or 2617938 counting only the distinct ones).

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

Adding to 20111220202120 its reverse (2120202211102), we get a palindrome (22231422413222).

The spelling of 20111220202120 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, two hundred two thousand, one hundred twenty".