102725423221 has 2 divisors, whose sum is σ = 102725423222. Its totient is φ = 102725423220.

The previous prime is 102725423219. The next prime is 102725423239. The reversal of 102725423221 is 122324527201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63056734321 + 39668688900 = 251111^2 + 199170^2 .

It is a cyclic number.

It is not a de Polignac number, because 102725423221 - 2¹ = 102725423219 is a prime.

Together with 102725423219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102725421221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51362711610 + 51362711611.

It is an arithmetic number, because the mean of its divisors is an integer number (51362711611).

Almost surely, 2^102725423221 is an apocalyptic number.

It is an amenable number.

102725423221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102725423221 is an equidigital number, since it uses as much as digits as its factorization.

102725423221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 102725423221 in words is "one hundred two billion, seven hundred twenty-five million, four hundred twenty-three thousand, two hundred twenty-one".