20000121010020 has 144 divisors (see below), whose sum is σ = 60709560912000. Its totient is φ = 5329628544000.

The previous prime is 20000121009991. The next prime is 20000121010049. The reversal of 20000121010020 is 2001012100002.

It is an interprime number because it is at equal distance from previous prime (20000121009991) and next prime (20000121010049).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20000121009984 and 20000121010011.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2030258095 + ... + 2030267945.

It is an arithmetic number, because the mean of its divisors is an integer number (421594173000).

Almost surely, 2^{20000121010020} is an apocalyptic number.

20000121010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000121010020 is an abundant number, since it is smaller than the sum of its proper divisors (40709439901980).

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

20000121010020 is a wasteful number, since it uses less digits than its factorization.

20000121010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626 (or 16621 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000121010020 its reverse (2001012100002), we get a palindrome (22001133110022).

The spelling of 20000121010020 in words is "twenty trillion, one hundred twenty-one million, ten thousand, twenty".