20111001021021 has 8 divisors (see below), whose sum is σ = 26814813610144. Its totient is φ = 13407261222960.

The previous prime is 20111001020899. The next prime is 20111001021029. The reversal of 20111001021021 is 12012010011102.

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

It is not a de Polignac number, because 20111001021021 - 2⁷ = 20111001020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111001020988 and 20111001021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111001021029) 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, 17549806 + ... + 18660591.

It is an arithmetic number, because the mean of its divisors is an integer number (3351851701268).

Almost surely, 2^{20111001021021} is an apocalyptic number.

It is an amenable number.

20111001021021 is a deficient number, since it is larger than the sum of its proper divisors (6703812589123).

20111001021021 is a wasteful number, since it uses less digits than its factorization.

20111001021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36395531.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20111001021021 its reverse (12012010011102), we get a palindrome (32123011032123).

The spelling of 20111001021021 in words is "twenty trillion, one hundred eleven billion, one million, twenty-one thousand, twenty-one".