102721181823 has 12 divisors (see below), whose sum is σ = 159788505240. Its totient is φ = 63213034896.

The previous prime is 102721181743. The next prime is 102721181869. The reversal of 102721181823 is 328181127201.

It is not a de Polignac number, because 102721181823 - 2²² = 102716987519 is a prime.

It is a super-2 number, since 2×102721181823² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102721181323) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 438979293 + ... + 438979526.

It is an arithmetic number, because the mean of its divisors is an integer number (13315708770).

Almost surely, 2^102721181823 is an apocalyptic number.

102721181823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

102721181823 is a deficient number, since it is larger than the sum of its proper divisors (57067323417).

102721181823 is a wasteful number, since it uses less digits than its factorization.

102721181823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877958838 (or 877958835 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 102721181823 in words is "one hundred two billion, seven hundred twenty-one million, one hundred eighty-one thousand, eight hundred twenty-three".