20121111121220 has 48 divisors (see below), whose sum is σ = 43289492843520. Its totient is φ = 7852351618944.

The previous prime is 20121111121207. The next prime is 20121111121261. The reversal of 20121111121220 is 2212111112102.

It is a super-2 number, since 2×20121111121220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33464540 + ... + 34060499.

It is an arithmetic number, because the mean of its divisors is an integer number (901864434240).

Almost surely, 2^{20121111121220} is an apocalyptic number.

20121111121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121111121220 is an abundant number, since it is smaller than the sum of its proper divisors (23168381722300).

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

20121111121220 is a wasteful number, since it uses less digits than its factorization.

20121111121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67525412 (or 67525410 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20121111121220 its reverse (2212111112102), we get a palindrome (22333222233322).

The spelling of 20121111121220 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty".