761221000121 has 2 divisors, whose sum is σ = 761221000122. Its totient is φ = 761221000120.

The previous prime is 761221000117. The next prime is 761221000217. The reversal of 761221000121 is 121000122167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504107100025 + 257113900096 = 710005^2 + 507064^2 .

It is an emirp because it is prime and its reverse (121000122167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 761221000121 - 2² = 761221000117 is a prime.

It is a super-2 number, since 2×761221000121² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (761221000921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380610500060 + 380610500061.

It is an arithmetic number, because the mean of its divisors is an integer number (380610500061).

Almost surely, 2^761221000121 is an apocalyptic number.

It is an amenable number.

761221000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

761221000121 is an equidigital number, since it uses as much as digits as its factorization.

761221000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 761221000121 its reverse (121000122167), we get a palindrome (882221122288).

The spelling of 761221000121 in words is "seven hundred sixty-one billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.