102721880105 has 32 divisors (see below), whose sum is σ = 133621971840. Its totient is φ = 75358241280.

The previous prime is 102721880101. The next prime is 102721880111. The reversal of 102721880105 is 501088127201.

It is not a de Polignac number, because 102721880105 - 2² = 102721880101 is a prime.

It is a super-2 number, since 2×102721880105² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102721880101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7797254 + ... + 7810416.

It is an arithmetic number, because the mean of its divisors is an integer number (4175686620).

Almost surely, 2^102721880105 is an apocalyptic number.

It is an amenable number.

102721880105 is a deficient number, since it is larger than the sum of its proper divisors (30900091735).

102721880105 is a wasteful number, since it uses less digits than its factorization.

102721880105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13961.

The product of its (nonzero) digits is 8960, while the sum is 35.

The spelling of 102721880105 in words is "one hundred two billion, seven hundred twenty-one million, eight hundred eighty thousand, one hundred five".