1721122394112 has 208 divisors, whose sum is σ = 5562548727360. Its totient is φ = 521551872000.

The previous prime is 1721122394111. The next prime is 1721122394137. The reversal of 1721122394112 is 2114932211271.

It is a happy number.

1721122394112 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 1 + 2 + 239 + 411 + 2 = 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 (1721122394111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509112 + ... + 1923912.

Almost surely, 2^{1721122394112} is an apocalyptic number.

1721122394112 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 1721122394112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2781274363680).

1721122394112 is an abundant number, since it is smaller than the sum of its proper divisors (3841426333248).

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

1721122394112 is a wasteful number, since it uses less digits than its factorization.

1721122394112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414845 (or 1414817 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The spelling of 1721122394112 in words is "one trillion, seven hundred twenty-one billion, one hundred twenty-two million, three hundred ninety-four thousand, one hundred twelve".