252155421 has 36 divisors (see below), whose sum is σ = 425179872. Its totient is φ = 144002376.

The previous prime is 252155419. The next prime is 252155429. The reversal of 252155421 is 124551252.

252155421 is a `hidden beast` number, since 25 + 215 + 5 + 421 = 666.

It is not a de Polignac number, because 252155421 - 2¹ = 252155419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252155429) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 150430 + ... + 152096.

It is an arithmetic number, because the mean of its divisors is an integer number (11810552).

Almost surely, 2^252155421 is an apocalyptic number.

252155421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

252155421 is a deficient number, since it is larger than the sum of its proper divisors (173024451).

252155421 is an frugal number, since it uses more digits than its factorization.

252155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1677 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 252155421 is about 15879.4024131892. The cubic root of 252155421 is about 631.7657869051.

The spelling of 252155421 in words is "two hundred fifty-two million, one hundred fifty-five thousand, four hundred twenty-one".