202121001100261 has 2 divisors, whose sum is σ = 202121001100262. Its totient is φ = 202121001100260.

The previous prime is 202121001100243. The next prime is 202121001100273. The reversal of 202121001100261 is 162001100121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175009245559236 + 27111755541025 = 13229106^2 + 5206895^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121001100261 - 2⁵ = 202121001100229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121001100661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060500550130 + 101060500550131.

It is an arithmetic number, because the mean of its divisors is an integer number (101060500550131).

Almost surely, 2^{202121001100261} is an apocalyptic number.

It is an amenable number.

202121001100261 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121001100261 is an equidigital number, since it uses as much as digits as its factorization.

202121001100261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 202121001100261 its reverse (162001100121202), we get a palindrome (364122101221463).

The spelling of 202121001100261 in words is "two hundred two trillion, one hundred twenty-one billion, one million, one hundred thousand, two hundred sixty-one".