1921963421700 has 432 divisors, whose sum is σ = 7033217900800. Its totient is φ = 438817720320.

The previous prime is 1921963421669. The next prime is 1921963421701. The reversal of 1921963421700 is 71243691291.

1921963421700 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 9 + 634 + 2 + 1 + 7 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1921963421701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 328145172 + ... + 328151028.

Almost surely, 2^{1921963421700} is an apocalyptic number.

1921963421700 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 1921963421700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3516608950400).

1921963421700 is an abundant number, since it is smaller than the sum of its proper divisors (5111254479100).

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

1921963421700 is a wasteful number, since it uses less digits than its factorization.

1921963421700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6961 (or 6937 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 1921963421700 in words is "one trillion, nine hundred twenty-one billion, nine hundred sixty-three million, four hundred twenty-one thousand, seven hundred".