10921987620 has 96 divisors (see below), whose sum is σ = 35978342400. Its totient is φ = 2741202432.

The previous prime is 10921987543. The next prime is 10921987631. The reversal of 10921987620 is 2678912901.

10921987620 is a `hidden beast` number, since 1 + 0 + 9 + 2 + 19 + 8 + 7 + 620 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 585700 + ... + 604059.

It is an arithmetic number, because the mean of its divisors is an integer number (374774400).

Almost surely, 2^10921987620 is an apocalyptic number.

10921987620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10921987620 is an abundant number, since it is smaller than the sum of its proper divisors (25056354780).

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

10921987620 is a wasteful number, since it uses less digits than its factorization.

10921987620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189794 (or 1189786 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 10921987620 in words is "ten billion, nine hundred twenty-one million, nine hundred eighty-seven thousand, six hundred twenty".