102128428251 has 24 divisors (see below), whose sum is σ = 157191338304. Its totient is φ = 63672410880.

The previous prime is 102128428247. The next prime is 102128428271. The reversal of 102128428251 is 152824821201.

It is a happy number.

102128428251 is a `hidden beast` number, since 10 + 212 + 8 + 428 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 102128428251 - 2² = 102128428247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102128428271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2101795 + ... + 2149836.

It is an arithmetic number, because the mean of its divisors is an integer number (6549639096).

Almost surely, 2^102128428251 is an apocalyptic number.

102128428251 is a deficient number, since it is larger than the sum of its proper divisors (55062910053).

102128428251 is a wasteful number, since it uses less digits than its factorization.

102128428251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251811 (or 4251808 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The spelling of 102128428251 in words is "one hundred two billion, one hundred twenty-eight million, four hundred twenty-eight thousand, two hundred fifty-one".