6981221040 has 80 divisors (see below), whose sum is σ = 22388076000. Its totient is φ = 1797462016.

The previous prime is 6981220997. The next prime is 6981221057. The reversal of 6981221040 is 401221896.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6981220992 and 6981221010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494565 + ... + 508484.

It is an arithmetic number, because the mean of its divisors is an integer number (279850950).

Almost surely, 2^6981221040 is an apocalyptic number.

6981221040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6981221040 is an abundant number, since it is smaller than the sum of its proper divisors (15406854960).

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

6981221040 is a wasteful number, since it uses less digits than its factorization.

6981221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003094 (or 1003088 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 6981221040 is about 83553.7015338040. The cubic root of 6981221040 is about 1911.2190385035.

The spelling of 6981221040 in words is "six billion, nine hundred eighty-one million, two hundred twenty-one thousand, forty".