102147425721 has 18 divisors (see below), whose sum is σ = 162178972410. Its totient is φ = 61907530080.

The previous prime is 102147425713. The next prime is 102147425749. The reversal of 102147425721 is 127524741201.

102147425721 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 47 + 42 + 572 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 102147356025 + 69696 = 319605^2 + 264^2 .

It is not a de Polignac number, because 102147425721 - 2³ = 102147425713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102147425771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46898556 + ... + 46900733.

Almost surely, 2^102147425721 is an apocalyptic number.

102147425721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102147425721 is a deficient number, since it is larger than the sum of its proper divisors (60031546689).

102147425721 is a wasteful number, since it uses less digits than its factorization.

102147425721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93799317 (or 93799303 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 102147425721 in words is "one hundred two billion, one hundred forty-seven million, four hundred twenty-five thousand, seven hundred twenty-one".