20111202010021 has 8 divisors (see below), whose sum is σ = 20131733352600. Its totient is φ = 20090671856640.

The previous prime is 20111202010001. The next prime is 20111202010049. The reversal of 20111202010021 is 12001020211102.

It can be written as a sum of positive squares in 4 ways, for example, as 1460680119396 + 18650521890625 = 1208586^2 + 4318625^2 .

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 20111202010021 - 2¹¹ = 20111202007973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111202009983 and 20111202010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111202010001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35771631 + ... + 36329491.

It is an arithmetic number, because the mean of its divisors is an integer number (2516466669075).

Almost surely, 2^{20111202010021} is an apocalyptic number.

It is an amenable number.

20111202010021 is a deficient number, since it is larger than the sum of its proper divisors (20531342579).

20111202010021 is a wasteful number, since it uses less digits than its factorization.

20111202010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594599.

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

Adding to 20111202010021 its reverse (12001020211102), we get a palindrome (32112222221123).

The spelling of 20111202010021 in words is "twenty trillion, one hundred eleven billion, two hundred two million, ten thousand, twenty-one".