1253555421 has 8 divisors (see below), whose sum is σ = 1729042080. Its totient is φ = 806886192.

The previous prime is 1253555399. The next prime is 1253555473. The reversal of 1253555421 is 1245553521.

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

It is not a de Polignac number, because 1253555421 - 2⁶ = 1253555357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253555321) 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, 7204255 + ... + 7204428.

It is an arithmetic number, because the mean of its divisors is an integer number (216130260).

Almost surely, 2^1253555421 is an apocalyptic number.

It is an amenable number.

1253555421 is a deficient number, since it is larger than the sum of its proper divisors (475486659).

1253555421 is a wasteful number, since it uses less digits than its factorization.

1253555421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14408715.

The product of its digits is 30000, while the sum is 33.

The square root of 1253555421 is about 35405.5846018675. The cubic root of 1253555421 is about 1078.2377011930.

The spelling of 1253555421 in words is "one billion, two hundred fifty-three million, five hundred fifty-five thousand, four hundred twenty-one".