102721279145 has 8 divisors (see below), whose sum is σ = 130516448904. Its totient is φ = 77343080704.

The previous prime is 102721279139. The next prime is 102721279169. The reversal of 102721279145 is 541972127201.

It can be written as a sum of positive squares in 4 ways, for example, as 54178614169 + 48542664976 = 232763^2 + 220324^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102721279145 - 2⁶ = 102721279081 is a prime.

It is a super-2 number, since 2×102721279145² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604242734 + ... + 604242903.

It is an arithmetic number, because the mean of its divisors is an integer number (16314556113).

Almost surely, 2^102721279145 is an apocalyptic number.

It is an amenable number.

102721279145 is a deficient number, since it is larger than the sum of its proper divisors (27795169759).

102721279145 is a wasteful number, since it uses less digits than its factorization.

102721279145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208485659.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 102721279145 in words is "one hundred two billion, seven hundred twenty-one million, two hundred seventy-nine thousand, one hundred forty-five".