20011220121120 has 192 divisors, whose sum is σ = 67683353262336. Its totient is φ = 4951685365760.

The previous prime is 20011220120921. The next prime is 20011220121149. The reversal of 20011220121120 is 2112102211002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20011220121120.

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, 16690749 + ... + 17849468.

It is an arithmetic number, because the mean of its divisors is an integer number (352517464908).

Almost surely, 2^{20011220121120} is an apocalyptic number.

20011220121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011220121120 is an abundant number, since it is smaller than the sum of its proper divisors (47672133141216).

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

20011220121120 is a wasteful number, since it uses less digits than its factorization.

20011220121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34540323 (or 34540315 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20011220121120 its reverse (2112102211002), we get a palindrome (22123322332122).

The spelling of 20011220121120 in words is "twenty trillion, eleven billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty".