1001011210261 has 2 divisors, whose sum is σ = 1001011210262. Its totient is φ = 1001011210260.

The previous prime is 1001011210159. The next prime is 1001011210267. The reversal of 1001011210261 is 1620121101001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890126206225 + 110885004036 = 943465^2 + 332994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001011210261 - 2⁹ = 1001011209749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001011210267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500505605130 + 500505605131.

It is an arithmetic number, because the mean of its divisors is an integer number (500505605131).

Almost surely, 2^{1001011210261} is an apocalyptic number.

It is an amenable number.

1001011210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001011210261 is an equidigital number, since it uses as much as digits as its factorization.

1001011210261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1001011210261 its reverse (1620121101001), we get a palindrome (2621132311262).

The spelling of 1001011210261 in words is "one trillion, one billion, eleven million, two hundred ten thousand, two hundred sixty-one".