253221012 has 48 divisors (see below), whose sum is σ = 716184000. Its totient is φ = 76733280.

The previous prime is 253220983. The next prime is 253221019. The reversal of 253221012 is 210122352.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253221019) 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, 105387 + ... + 107762.

It is an arithmetic number, because the mean of its divisors is an integer number (14920500).

Almost surely, 2^253221012 is an apocalyptic number.

253221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

253221012 is an abundant number, since it is smaller than the sum of its proper divisors (462962988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253221012 is a wasteful number, since it uses less digits than its factorization.

253221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213173 (or 213165 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 253221012 is about 15912.9196566815. The cubic root of 253221012 is about 632.6544687743.

Adding to 253221012 its reverse (210122352), we get a palindrome (463343364).

The spelling of 253221012 in words is "two hundred fifty-three million, two hundred twenty-one thousand, twelve".