1212220254 has 64 divisors (see below), whose sum is σ = 2966169600. Its totient is φ = 322545888.

The previous prime is 1212220237. The next prime is 1212220259. The reversal of 1212220254 is 4520222121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212220254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34209 + ... + 59955.

It is an arithmetic number, because the mean of its divisors is an integer number (46346400).

Almost surely, 2^1212220254 is an apocalyptic number.

1212220254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212220254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483084800).

1212220254 is an abundant number, since it is smaller than the sum of its proper divisors (1753949346).

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

1212220254 is a wasteful number, since it uses less digits than its factorization.

1212220254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25837.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1212220254 is about 34816.9535427786. The cubic root of 1212220254 is about 1066.2536037136.

Adding to 1212220254 its reverse (4520222121), we get a palindrome (5732442375).

The spelling of 1212220254 in words is "one billion, two hundred twelve million, two hundred twenty thousand, two hundred fifty-four".