1421997817680 has 480 divisors, whose sum is σ = 5457566943360. Its totient is φ = 339999897600.

The previous prime is 1421997817673. The next prime is 1421997817727. The reversal of 1421997817680 is 867187991241.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19042015 + ... + 19116545.

It is an arithmetic number, because the mean of its divisors is an integer number (11369931132).

Almost surely, 2^{1421997817680} is an apocalyptic number.

1421997817680 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 1421997817680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2728783471680).

1421997817680 is an abundant number, since it is smaller than the sum of its proper divisors (4035569125680).

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

1421997817680 is a wasteful number, since it uses less digits than its factorization.

1421997817680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74648 (or 74625 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The spelling of 1421997817680 in words is "one trillion, four hundred twenty-one billion, nine hundred ninety-seven million, eight hundred seventeen thousand, six hundred eighty".