7421528128061 has 2 divisors, whose sum is σ = 7421528128062. Its totient is φ = 7421528128060.

The previous prime is 7421528128033. The next prime is 7421528128097. The reversal of 7421528128061 is 1608218251247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7383583425625 + 37944702436 = 2717275^2 + 194794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7421528128061 is a prime.

It is a super-2 number, since 2×7421528128061² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7421528127997 and 7421528128015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7421528128031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710764064030 + 3710764064031.

It is an arithmetic number, because the mean of its divisors is an integer number (3710764064031).

Almost surely, 2^{7421528128061} is an apocalyptic number.

It is an amenable number.

7421528128061 is a deficient number, since it is larger than the sum of its proper divisors (1).

7421528128061 is an equidigital number, since it uses as much as digits as its factorization.

7421528128061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 7421528128061 in words is "seven trillion, four hundred twenty-one billion, five hundred twenty-eight million, one hundred twenty-eight thousand, sixty-one".