20000021121020 has 96 divisors (see below), whose sum is σ = 44680963891200. Its totient is φ = 7498452662784.

The previous prime is 20000021120951. The next prime is 20000021121049. The reversal of 20000021121020 is 2012112000002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20000021120992 and 20000021121010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42310136 + ... + 42780224.

It is an arithmetic number, because the mean of its divisors is an integer number (465426707200).

Almost surely, 2^{20000021121020} is an apocalyptic number.

20000021121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000021121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22340481945600).

20000021121020 is an abundant number, since it is smaller than the sum of its proper divisors (24680942770180).

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

20000021121020 is a wasteful number, since it uses less digits than its factorization.

20000021121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471307 (or 471305 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20000021121020 its reverse (2012112000002), we get a palindrome (22012133121022).

The spelling of 20000021121020 in words is "twenty trillion, twenty-one million, one hundred twenty-one thousand, twenty".