21097481689988 has 48 divisors (see below), whose sum is σ = 40558868840448. Its totient is φ = 9522702660000.

The previous prime is 21097481689913. The next prime is 21097481689997. The reversal of 21097481689988 is 88998618479012.

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, 17261543 + ... + 18443313.

It is an arithmetic number, because the mean of its divisors is an integer number (844976434176).

Almost surely, 2^{21097481689988} is an apocalyptic number.

It is an amenable number.

21097481689988 is a deficient number, since it is larger than the sum of its proper divisors (19461387150460).

21097481689988 is a wasteful number, since it uses less digits than its factorization.

21097481689988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184624 (or 1184622 counting only the distinct ones).

The product of its (nonzero) digits is 1003290624, while the sum is 80.

The spelling of 21097481689988 in words is "twenty-one trillion, ninety-seven billion, four hundred eighty-one million, six hundred eighty-nine thousand, nine hundred eighty-eight".