7890221121061 has 2 divisors, whose sum is σ = 7890221121062. Its totient is φ = 7890221121060.

The previous prime is 7890221121001. The next prime is 7890221121103. The reversal of 7890221121061 is 1601211220987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6535022464161 + 1355198656900 = 2556369^2 + 1164130^2 .

It is a cyclic number.

It is not a de Polignac number, because 7890221121061 - 2²¹ = 7890219023909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7890221121001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3945110560530 + 3945110560531.

It is an arithmetic number, because the mean of its divisors is an integer number (3945110560531).

Almost surely, 2^{7890221121061} is an apocalyptic number.

It is an amenable number.

7890221121061 is a deficient number, since it is larger than the sum of its proper divisors (1).

7890221121061 is an equidigital number, since it uses as much as digits as its factorization.

7890221121061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 7890221121061 in words is "seven trillion, eight hundred ninety billion, two hundred twenty-one million, one hundred twenty-one thousand, sixty-one".