20010010020021 has 288 divisors, whose sum is σ = 36167695828992. Its totient is φ = 11016836490240.

The previous prime is 20010010020001. The next prime is 20010010020023. The reversal of 20010010020021 is 12002001001002.

It is not a de Polignac number, because 20010010020021 - 2⁹ = 20010010019509 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20010010019985 and 20010010020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010010020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 11453925870 + ... + 11453927616.

It is an arithmetic number, because the mean of its divisors is an integer number (125582277184).

Almost surely, 2^{20010010020021} is an apocalyptic number.

20010010020021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20010010020021 is a deficient number, since it is larger than the sum of its proper divisors (16157685808971).

20010010020021 is a wasteful number, since it uses less digits than its factorization.

20010010020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131 (or 2112 counting only the distinct ones).

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

Adding to 20010010020021 its reverse (12002001001002), we get a palindrome (32012011021023).

The spelling of 20010010020021 in words is "twenty trillion, ten billion, ten million, twenty thousand, twenty-one".