253355021 has 8 divisors (see below), whose sum is σ = 264470424. Its totient is φ = 242464320.

The previous prime is 253355017. The next prime is 253355023. The reversal of 253355021 is 120553352.

253355021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3556996 + 249798025 = 1886^2 + 15805^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253355021 - 2² = 253355017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253355023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53870 + ... + 58383.

It is an arithmetic number, because the mean of its divisors is an integer number (33058803).

Almost surely, 2^253355021 is an apocalyptic number.

It is an amenable number.

253355021 is a deficient number, since it is larger than the sum of its proper divisors (11115403).

253355021 is a wasteful number, since it uses less digits than its factorization.

253355021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112351.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 253355021 is about 15917.1297977996. The cubic root of 253355021 is about 632.7660530389.

The spelling of 253355021 in words is "two hundred fifty-three million, three hundred fifty-five thousand, twenty-one".