20100121101020 has 72 divisors (see below), whose sum is σ = 46485676095264. Its totient is φ = 7285718892672.

The previous prime is 20100121101013. The next prime is 20100121101059. The reversal of 20100121101020 is 2010112100102.

It is a super-3 number, since 3×20100121101020³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20100121100992 and 20100121101010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60354599 + ... + 60686718.

It is an arithmetic number, because the mean of its divisors is an integer number (645634390212).

Almost surely, 2^{20100121101020} is an apocalyptic number.

20100121101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100121101020 is an abundant number, since it is smaller than the sum of its proper divisors (26385554994244).

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

20100121101020 is a wasteful number, since it uses less digits than its factorization.

20100121101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121041387 (or 121041366 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20100121101020 its reverse (2010112100102), we get a palindrome (22110233201122).

The spelling of 20100121101020 in words is "twenty trillion, one hundred billion, one hundred twenty-one million, one hundred one thousand, twenty".