102421072 has 20 divisors (see below), whose sum is σ = 213705940. Its totient is φ = 47271168.

The previous prime is 102421061. The next prime is 102421079. The reversal of 102421072 is 270124201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17338896 + 85082176 = 4164^2 + 9224^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102421079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245997 + ... + 246412.

It is an arithmetic number, because the mean of its divisors is an integer number (10685297).

Almost surely, 2^102421072 is an apocalyptic number.

It is an amenable number.

102421072 is an abundant number, since it is smaller than the sum of its proper divisors (111284868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102421072 is a wasteful number, since it uses less digits than its factorization.

102421072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492430 (or 492424 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 102421072 is about 10120.3296389001. The cubic root of 102421072 is about 467.8749270077.

Adding to 102421072 its reverse (270124201), we get a palindrome (372545273).

The spelling of 102421072 in words is "one hundred two million, four hundred twenty-one thousand, seventy-two".