20210011021021 has 16 divisors (see below), whose sum is σ = 20552270042304. Its totient is φ = 19870332931584.

The previous prime is 20210011020977. The next prime is 20210011021099. The reversal of 20210011021021 is 12012011001202.

It is a cyclic number.

It is not a de Polignac number, because 20210011021021 - 2²¹ = 20210008923869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210011020992 and 20210011021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210011021721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13758925 + ... + 15156781.

It is an arithmetic number, because the mean of its divisors is an integer number (1284516877644).

Almost surely, 2^{20210011021021} is an apocalyptic number.

It is an amenable number.

20210011021021 is a deficient number, since it is larger than the sum of its proper divisors (342259021283).

20210011021021 is a wasteful number, since it uses less digits than its factorization.

20210011021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398780.

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

Adding to 20210011021021 its reverse (12012011001202), we get a palindrome (32222022022223).

The spelling of 20210011021021 in words is "twenty trillion, two hundred ten billion, eleven million, twenty-one thousand, twenty-one".