102044021 has 2 divisors, whose sum is σ = 102044022. Its totient is φ = 102044020.

The previous prime is 102044009. The next prime is 102044023. The reversal of 102044021 is 120440201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 24850225 = 8786^2 + 4985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102044021 is a prime.

Together with 102044023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 102043987 and 102044005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102044023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51022010 + 51022011.

It is an arithmetic number, because the mean of its divisors is an integer number (51022011).

Almost surely, 2^102044021 is an apocalyptic number.

It is an amenable number.

102044021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102044021 is an equidigital number, since it uses as much as digits as its factorization.

102044021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 102044021 is about 10101.6840675206. The cubic root of 102044021 is about 467.3000790450.

Adding to 102044021 its reverse (120440201), we get a palindrome (222484222).

The spelling of 102044021 in words is "one hundred two million, forty-four thousand, twenty-one".