111010001020021 has 2 divisors, whose sum is σ = 111010001020022. Its totient is φ = 111010001020020.

The previous prime is 111010001019979. The next prime is 111010001020031. The reversal of 111010001020021 is 120020100010111.

It is an a-pointer prime, because the next prime (111010001020031) can be obtained adding 111010001020021 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64781410716100 + 46228590303921 = 8048690^2 + 6799161^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010001020021 - 2¹⁵ = 111010000987253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111010001020031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505000510010 + 55505000510011.

It is an arithmetic number, because the mean of its divisors is an integer number (55505000510011).

Almost surely, 2^{111010001020021} is an apocalyptic number.

It is an amenable number.

111010001020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010001020021 is an equidigital number, since it uses as much as digits as its factorization.

111010001020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111010001020021 its reverse (120020100010111), we get a palindrome (231030101030132).

The spelling of 111010001020021 in words is "one hundred eleven trillion, ten billion, one million, twenty thousand, twenty-one".