1213451204 has 48 divisors (see below), whose sum is σ = 2570308608. Its totient is φ = 489997728.

The previous prime is 1213451191. The next prime is 1213451219. The reversal of 1213451204 is 4021543121.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 1213451204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29087 + ... + 57209.

It is an arithmetic number, because the mean of its divisors is an integer number (53548096).

Almost surely, 2^1213451204 is an apocalyptic number.

1213451204 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 1213451204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285154304).

1213451204 is an abundant number, since it is smaller than the sum of its proper divisors (1356857404).

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

1213451204 is a wasteful number, since it uses less digits than its factorization.

1213451204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28224 (or 28222 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1213451204 is about 34834.6265086910. The cubic root of 1213451204 is about 1066.6143909711.

Adding to 1213451204 its reverse (4021543121), we get a palindrome (5234994325).

The spelling of 1213451204 in words is "one billion, two hundred thirteen million, four hundred fifty-one thousand, two hundred four".