1212531320000 has 840 divisors, whose sum is σ = 4069006226208. Its totient is φ = 348733440000.

The previous prime is 1212531319973. The next prime is 1212531320047. The reversal of 1212531320000 is 231352121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 440438624 + ... + 440441376.

Almost surely, 2^{1212531320000} is an apocalyptic number.

1212531320000 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 1212531320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2034503113104).

1212531320000 is an abundant number, since it is smaller than the sum of its proper divisors (2856474906208).

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

1212531320000 is a wasteful number, since it uses less digits than its factorization.

1212531320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 1212531320000 its reverse (231352121), we get a palindrome (1212762672121).

The spelling of 1212531320000 in words is "one trillion, two hundred twelve billion, five hundred thirty-one million, three hundred twenty thousand".