102124021 has 4 divisors (see below), whose sum is σ = 102191500. Its totient is φ = 102056544.

The previous prime is 102123977. The next prime is 102124037. The reversal of 102124021 is 120421201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120421201 = 79 ⋅1524319.

It can be written as a sum of positive squares in 2 ways, for example, as 33466225 + 68657796 = 5785^2 + 8286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102124021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102123992 and 102124010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102124721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31416 + ... + 34513.

It is an arithmetic number, because the mean of its divisors is an integer number (25547875).

Almost surely, 2^102124021 is an apocalyptic number.

It is an amenable number.

102124021 is a deficient number, since it is larger than the sum of its proper divisors (67479).

102124021 is an equidigital number, since it uses as much as digits as its factorization.

102124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67478.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 102124021 is about 10105.6430275366. The cubic root of 102124021 is about 467.4221643987.

Adding to 102124021 its reverse (120421201), we get a palindrome (222545222).

The spelling of 102124021 in words is "one hundred two million, one hundred twenty-four thousand, twenty-one".