253020421 has 2 divisors, whose sum is σ = 253020422. Its totient is φ = 253020420.

The previous prime is 253020403. The next prime is 253020431. The reversal of 253020421 is 124020352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246333025 + 6687396 = 15695^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 253020421 - 2⁷ = 253020293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253020431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126510210 + 126510211.

It is an arithmetic number, because the mean of its divisors is an integer number (126510211).

Almost surely, 2^253020421 is an apocalyptic number.

It is an amenable number.

253020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

253020421 is an equidigital number, since it uses as much as digits as its factorization.

253020421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 253020421 is about 15906.6156362691. The cubic root of 253020421 is about 632.4873705863.

Adding to 253020421 its reverse (124020352), we get a palindrome (377040773).

The spelling of 253020421 in words is "two hundred fifty-three million, twenty thousand, four hundred twenty-one".