1210921451712 has 840 divisors, whose sum is σ = 4370485442400. Its totient is φ = 330115129344.

The previous prime is 1210921451651. The next prime is 1210921451717. The reversal of 1210921451712 is 2171541290121.

It is a happy number.

1210921451712 is a `hidden beast` number, since 1 + 2 + 109 + 21 + 4 + 517 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1210921451717) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 655614373 + ... + 655616219.

It is an arithmetic number, because the mean of its divisors is an integer number (5202958860).

Almost surely, 2^{1210921451712} is an apocalyptic number.

1210921451712 is a gapful number since it is divisible by the number (12) 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 1210921451712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2185242721200).

1210921451712 is an abundant number, since it is smaller than the sum of its proper divisors (3159563990688).

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

1210921451712 is a wasteful number, since it uses less digits than its factorization.

1210921451712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 1210921451712 in words is "one trillion, two hundred ten billion, nine hundred twenty-one million, four hundred fifty-one thousand, seven hundred twelve".