102011111110021 has 4 divisors (see below), whose sum is σ = 102027831508044. Its totient is φ = 101994390712000.

The previous prime is 102011111110003. The next prime is 102011111110037. The reversal of 102011111110021 is 120011111110201.

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 81310076184100 + 20701034925921 = 9017210^2 + 4549839^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011111110021 - 2¹³ = 102011111101829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102011111109983 and 102011111110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102011111110621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8360189860 + ... + 8360202061.

It is an arithmetic number, because the mean of its divisors is an integer number (25506957877011).

Almost surely, 2^{102011111110021} is an apocalyptic number.

It is an amenable number.

102011111110021 is a deficient number, since it is larger than the sum of its proper divisors (16720398023).

102011111110021 is an equidigital number, since it uses as much as digits as its factorization.

102011111110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16720398022.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 102011111110021 its reverse (120011111110201), we get a palindrome (222022222220222).

The spelling of 102011111110021 in words is "one hundred two trillion, eleven billion, one hundred eleven million, one hundred ten thousand, twenty-one".