1213512300 has 576 divisors, whose sum is σ = 5249664000. Its totient is φ = 232243200.

The previous prime is 1213512299. The next prime is 1213512323. The reversal of 1213512300 is 32153121.

1213512300 is a `hidden beast` number, since 12 + 1 + 351 + 2 + 300 = 666.

It is a super-2 number, since 2×1213512300² = 2945224204502580000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2702476 + ... + 2702924.

It is an arithmetic number, because the mean of its divisors is an integer number (9114000).

Almost surely, 2^1213512300 is an apocalyptic number.

1213512300 is a gapful number since it is divisible by the number (10) 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 1213512300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624832000).

1213512300 is an abundant number, since it is smaller than the sum of its proper divisors (4036151700).

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

1213512300 is a wasteful number, since it uses less digits than its factorization.

1213512300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1213512300 is about 34835.5034411733. The cubic root of 1213512300 is about 1066.6322916440.

Adding to 1213512300 its reverse (32153121), we get a palindrome (1245665421).

The spelling of 1213512300 in words is "one billion, two hundred thirteen million, five hundred twelve thousand, three hundred".