20011021201021 has 8 divisors (see below), whose sum is σ = 21064891186080. Its totient is φ = 18957217050288.

The previous prime is 20011021201001. The next prime is 20011021201069. The reversal of 20011021201021 is 12010212011002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20011021201021 - 2¹⁵ = 20011021168253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011021200992 and 20011021201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011021201001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15834046 + ... + 17051071.

It is an arithmetic number, because the mean of its divisors is an integer number (2633111398260).

Almost surely, 2^{20011021201021} is an apocalyptic number.

It is an amenable number.

20011021201021 is a deficient number, since it is larger than the sum of its proper divisors (1053869985059).

20011021201021 is a wasteful number, since it uses less digits than its factorization.

20011021201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32917163.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011021201021 its reverse (12010212011002), we get a palindrome (32021233212023).

The spelling of 20011021201021 in words is "twenty trillion, eleven billion, twenty-one million, two hundred one thousand, twenty-one".