102525021 has 10 divisors (see below), whose sum is σ = 153154782. Its totient is φ = 68349960.

The previous prime is 102525019. The next prime is 102525037. The reversal of 102525021 is 120525201.

It can be written as a sum of positive squares in only one way, i.e., 56475225 + 46049796 = 7515^2 + 6786^2 .

It is not a de Polignac number, because 102525021 - 2¹ = 102525019 is a prime.

It is a super-2 number, since 2×102525021² = 21022759862100882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102524985 and 102525003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102525041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 632790 + ... + 632951.

Almost surely, 2^102525021 is an apocalyptic number.

It is an amenable number.

102525021 is a deficient number, since it is larger than the sum of its proper divisors (50629761).

102525021 is an equidigital number, since it uses as much as digits as its factorization.

102525021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265753 (or 1265744 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 102525021 is about 10125.4639893686. The cubic root of 102525021 is about 468.0331584001.

The spelling of 102525021 in words is "one hundred two million, five hundred twenty-five thousand, twenty-one".