253034021 has 2 divisors, whose sum is σ = 253034022. Its totient is φ = 253034020.

The previous prime is 253034011. The next prime is 253034029. The reversal of 253034021 is 120430352.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222904900 + 30129121 = 14930^2 + 5489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253034021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253033984 and 253034002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253034029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126517010 + 126517011.

It is an arithmetic number, because the mean of its divisors is an integer number (126517011).

Almost surely, 2^253034021 is an apocalyptic number.

It is an amenable number.

253034021 is a deficient number, since it is larger than the sum of its proper divisors (1).

253034021 is an equidigital number, since it uses as much as digits as its factorization.

253034021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 253034021 is about 15907.0431256095. The cubic root of 253034021 is about 632.4987025756.

Adding to 253034021 its reverse (120430352), we get a palindrome (373464373).

The spelling of 253034021 in words is "two hundred fifty-three million, thirty-four thousand, twenty-one".