1212013600 has 72 divisors (see below), whose sum is σ = 3381533568. Its totient is φ = 415545600.

The previous prime is 1212013547. The next prime is 1212013601. The reversal of 1212013600 is 63102121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212013601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102616 + ... + 113815.

It is an arithmetic number, because the mean of its divisors is an integer number (46965744).

Almost surely, 2^1212013600 is an apocalyptic number.

1212013600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212013600 is an abundant number, since it is smaller than the sum of its proper divisors (2169519968).

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

1212013600 is a wasteful number, since it uses less digits than its factorization.

1212013600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216458 (or 216445 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1212013600 is about 34813.9856954070. The cubic root of 1212013600 is about 1066.1930101887.

Adding to 1212013600 its reverse (63102121), we get a palindrome (1275115721).

The spelling of 1212013600 in words is "one billion, two hundred twelve million, thirteen thousand, six hundred".