253553421 has 16 divisors (see below), whose sum is σ = 369681408. Its totient is φ = 153303600.

The previous prime is 253553411. The next prime is 253553429. The reversal of 253553421 is 124355352.

It is not a de Polignac number, because 253553421 - 2¹⁸ = 253291277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253553429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5310 + ... + 23136.

It is an arithmetic number, because the mean of its divisors is an integer number (23105088).

Almost surely, 2^253553421 is an apocalyptic number.

It is an amenable number.

253553421 is a deficient number, since it is larger than the sum of its proper divisors (116127987).

253553421 is a wasteful number, since it uses less digits than its factorization.

253553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18272.

The product of its digits is 18000, while the sum is 30.

The square root of 253553421 is about 15923.3608575577. The cubic root of 253553421 is about 632.9311810461.

The spelling of 253553421 in words is "two hundred fifty-three million, five hundred fifty-three thousand, four hundred twenty-one".