20110021010021 has 4 divisors (see below), whose sum is σ = 20193465080844. Its totient is φ = 20026576939200.

The previous prime is 20110021009937. The next prime is 20110021010029. The reversal of 20110021010021 is 12001012001102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5717292259396 + 14392728750625 = 2391086^2 + 3793775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110021010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110021009984 and 20110021010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110021010029) 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 3 ways as a sum of consecutive naturals, for example, 41722035050 + ... + 41722035531.

It is an arithmetic number, because the mean of its divisors is an integer number (5048366270211).

Almost surely, 2^{20110021010021} is an apocalyptic number.

It is an amenable number.

20110021010021 is a deficient number, since it is larger than the sum of its proper divisors (83444070823).

20110021010021 is an equidigital number, since it uses as much as digits as its factorization.

20110021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83444070822.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20110021010021 its reverse (12001012001102), we get a palindrome (32111033011123).

The spelling of 20110021010021 in words is "twenty trillion, one hundred ten billion, twenty-one million, ten thousand, twenty-one".