21201112002101 has 2 divisors, whose sum is σ = 21201112002102. Its totient is φ = 21201112002100.

The previous prime is 21201112002043. The next prime is 21201112002113. The reversal of 21201112002101 is 10120021110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17141471331076 + 4059640671025 = 4140226^2 + 2014855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201112002101 - 2⁴² = 16803065490997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201132002101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600556001050 + 10600556001051.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556001051).

Almost surely, 2^{21201112002101} is an apocalyptic number.

It is an amenable number.

21201112002101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112002101 is an equidigital number, since it uses as much as digits as its factorization.

21201112002101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201112002101 its reverse (10120021110212), we get a palindrome (31321133112313).

The spelling of 21201112002101 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, two thousand, one hundred one".