125202421 has 2 divisors, whose sum is σ = 125202422. Its totient is φ = 125202420.

The previous prime is 125202379. The next prime is 125202449. The reversal of 125202421 is 124202521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116856100 + 8346321 = 10810^2 + 2889^2 .

It is an emirp because it is prime and its reverse (124202521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125202421 - 2¹¹ = 125200373 is a prime.

It is a super-2 number, since 2×125202421² = 31351292448522482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125202461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62601210 + 62601211.

It is an arithmetic number, because the mean of its divisors is an integer number (62601211).

Almost surely, 2^125202421 is an apocalyptic number.

It is an amenable number.

125202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125202421 is an equidigital number, since it uses as much as digits as its factorization.

125202421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 125202421 is about 11189.3887679354. The cubic root of 125202421 is about 500.2697491113.

Adding to 125202421 its reverse (124202521), we get a palindrome (249404942).

It can be divided in two parts, 12520 and 2421, that added together give a palindrome (14941).

The spelling of 125202421 in words is "one hundred twenty-five million, two hundred two thousand, four hundred twenty-one".