1212151224 has 64 divisors (see below), whose sum is σ = 3157056000. Its totient is φ = 387495680.

The previous prime is 1212151223. The next prime is 1212151231. The reversal of 1212151224 is 4221512121.

It is a self number, because there is not a number n which added to its sum of digits gives 1212151224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212151223) 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, 47617 + ... + 68495.

It is an arithmetic number, because the mean of its divisors is an integer number (49329000).

Almost surely, 2^1212151224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212151224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578528000).

1212151224 is an abundant number, since it is smaller than the sum of its proper divisors (1944904776).

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

1212151224 is a wasteful number, since it uses less digits than its factorization.

1212151224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20988 (or 20984 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 1212151224 is about 34815.9622012662. The cubic root of 1212151224 is about 1066.2333640245.

Adding to 1212151224 its reverse (4221512121), we get a palindrome (5433663345).

The spelling of 1212151224 in words is "one billion, two hundred twelve million, one hundred fifty-one thousand, two hundred twenty-four".