1921521924660 has 192 divisors, whose sum is σ = 5813353728000. Its totient is φ = 471423214080.

The previous prime is 1921521924631. The next prime is 1921521924691. The reversal of 1921521924660 is 664291251291.

It is a super-2 number, since 2×1921521924660² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 343678465 + ... + 343684055.

It is an arithmetic number, because the mean of its divisors is an integer number (30277884000).

Almost surely, 2^{1921521924660} is an apocalyptic number.

1921521924660 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 1921521924660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2906676864000).

1921521924660 is an abundant number, since it is smaller than the sum of its proper divisors (3891831803340).

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

1921521924660 is a wasteful number, since it uses less digits than its factorization.

1921521924660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6998 (or 6996 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 1921521924660 in words is "one trillion, nine hundred twenty-one billion, five hundred twenty-one million, nine hundred twenty-four thousand, six hundred sixty".