20111221011020 has 48 divisors (see below), whose sum is σ = 42622224062880. Its totient is φ = 7970462083584.

The previous prime is 20111221010929. The next prime is 20111221011041. The reversal of 20111221011020 is 2011012211102.

It is a super-2 number, since 2×20111221011020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111221010986 and 20111221011004.

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, 92905952 + ... + 93122168.

It is an arithmetic number, because the mean of its divisors is an integer number (887963001310).

Almost surely, 2^{20111221011020} is an apocalyptic number.

20111221011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111221011020 is an abundant number, since it is smaller than the sum of its proper divisors (22511003051860).

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

20111221011020 is a wasteful number, since it uses less digits than its factorization.

20111221011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259002 (or 259000 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111221011020 its reverse (2011012211102), we get a palindrome (22122233222122).

The spelling of 20111221011020 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, eleven thousand, twenty".