7421125381 has 2 divisors, whose sum is σ = 7421125382. Its totient is φ = 7421125380.

The previous prime is 7421125343. The next prime is 7421125427. The reversal of 7421125381 is 1835211247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5609261025 + 1811864356 = 74895^2 + 42566^2 .

It is an emirp because it is prime and its reverse (1835211247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7421125381 - 2²¹ = 7419028229 is a prime.

It is a super-2 number, since 2×7421125381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7421125321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710562690 + 3710562691.

It is an arithmetic number, because the mean of its divisors is an integer number (3710562691).

Almost surely, 2^7421125381 is an apocalyptic number.

It is an amenable number.

7421125381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7421125381 is an equidigital number, since it uses as much as digits as its factorization.

7421125381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 7421125381 is about 86145.9539444541. The cubic root of 7421125381 is about 1950.5477646781.

The spelling of 7421125381 in words is "seven billion, four hundred twenty-one million, one hundred twenty-five thousand, three hundred eighty-one".