20101222121020 has 48 divisors (see below), whose sum is σ = 43669190476800. Its totient is φ = 7763049584640.

The previous prime is 20101222120997. The next prime is 20101222121047. The reversal of 20101222121020 is 2012122210102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20101222120985 and 20101222121003.

It is a congruent number.

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, 25973260 + ... + 26735980.

It is an arithmetic number, because the mean of its divisors is an integer number (909774801600).

Almost surely, 2^{20101222121020} is an apocalyptic number.

20101222121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101222121020 is an abundant number, since it is smaller than the sum of its proper divisors (23567968355780).

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

20101222121020 is a wasteful number, since it uses less digits than its factorization.

20101222121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808198 (or 808196 counting only the distinct ones).

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

Adding to 20101222121020 its reverse (2012122210102), we get a palindrome (22113344331122).

The spelling of 20101222121020 in words is "twenty trillion, one hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty".