102421055 has 48 divisors (see below), whose sum is σ = 143818752. Its totient is φ = 69854400.

The previous prime is 102421049. The next prime is 102421057. The reversal of 102421055 is 550124201.

It is not a de Polignac number, because 102421055 - 2²⁶ = 35312191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102421057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 806402 + ... + 806528.

It is an arithmetic number, because the mean of its divisors is an integer number (2996224).

Almost surely, 2^102421055 is an apocalyptic number.

102421055 is a deficient number, since it is larger than the sum of its proper divisors (41397697).

102421055 is a wasteful number, since it uses less digits than its factorization.

102421055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 102421055 is about 10120.3287990065. The cubic root of 102421055 is about 467.8749011215.

Adding to 102421055 its reverse (550124201), we get a palindrome (652545256).

The spelling of 102421055 in words is "one hundred two million, four hundred twenty-one thousand, fifty-five".