20012020210261 has 2 divisors, whose sum is σ = 20012020210262. Its totient is φ = 20012020210260.

The previous prime is 20012020210243. The next prime is 20012020210279. The reversal of 20012020210261 is 16201202021002.

It is a balanced prime because it is at equal distance from previous prime (20012020210243) and next prime (20012020210279).

It can be written as a sum of positive squares in only one way, i.e., 18409849048900 + 1602171161361 = 4290670^2 + 1265769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012020210261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012020210211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006010105130 + 10006010105131.

It is an arithmetic number, because the mean of its divisors is an integer number (10006010105131).

Almost surely, 2^{20012020210261} is an apocalyptic number.

It is an amenable number.

20012020210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012020210261 is an equidigital number, since it uses as much as digits as its factorization.

20012020210261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20012020210261 its reverse (16201202021002), we get a palindrome (36213222231263).

The spelling of 20012020210261 in words is "twenty trillion, twelve billion, twenty million, two hundred ten thousand, two hundred sixty-one".