21102111120493 has 16 divisors (see below), whose sum is σ = 23095416339072. Its totient is φ = 19162862712000.

The previous prime is 21102111120469. The next prime is 21102111120509. The reversal of 21102111120493 is 39402111120112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102111120493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102111120413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24371163 + ... + 25222168.

It is an arithmetic number, because the mean of its divisors is an integer number (1443463521192).

Almost surely, 2^{21102111120493} is an apocalyptic number.

It is an amenable number.

21102111120493 is a deficient number, since it is larger than the sum of its proper divisors (1993305218579).

21102111120493 is a wasteful number, since it uses less digits than its factorization.

21102111120493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49593876.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 21102111120493 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred twenty thousand, four hundred ninety-three".