125503421 has 2 divisors, whose sum is σ = 125503422. Its totient is φ = 125503420.

The previous prime is 125503393. The next prime is 125503423. The reversal of 125503421 is 124305521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90516196 + 34987225 = 9514^2 + 5915^2 .

It is an emirp because it is prime and its reverse (124305521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125503421 - 2¹⁰ = 125502397 is a prime.

It is a super-2 number, since 2×125503421² = 31502217365406482, which contains 22 as substring.

Together with 125503423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125503423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62751710 + 62751711.

It is an arithmetic number, because the mean of its divisors is an integer number (62751711).

Almost surely, 2^125503421 is an apocalyptic number.

It is an amenable number.

125503421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125503421 is an equidigital number, since it uses as much as digits as its factorization.

125503421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 125503421 is about 11202.8309368659. The cubic root of 125503421 is about 500.6703289167.

Adding to 125503421 its reverse (124305521), we get a palindrome (249808942).

The spelling of 125503421 in words is "one hundred twenty-five million, five hundred three thousand, four hundred twenty-one".