1212521604 has 96 divisors (see below), whose sum is σ = 3321077760. Its totient is φ = 337126272.

The previous prime is 1212521591. The next prime is 1212521627. The reversal of 1212521604 is 4061252121.

It is an unprimeable number.

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, 776977 + ... + 778535.

It is an arithmetic number, because the mean of its divisors is an integer number (34594560).

Almost surely, 2^1212521604 is an apocalyptic number.

1212521604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212521604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660538880).

1212521604 is an abundant number, since it is smaller than the sum of its proper divisors (2108556156).

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

1212521604 is a wasteful number, since it uses less digits than its factorization.

1212521604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1212521604 is about 34821.2809069397. The cubic root of 1212521604 is about 1066.3419509427.

Adding to 1212521604 its reverse (4061252121), we get a palindrome (5273773725).

The spelling of 1212521604 in words is "one billion, two hundred twelve million, five hundred twenty-one thousand, six hundred four".