102322721 has 2 divisors, whose sum is σ = 102322722. Its totient is φ = 102322720.

The previous prime is 102322687. The next prime is 102322729. The reversal of 102322721 is 127223201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 48094225 = 7364^2 + 6935^2 .

It is a cyclic number.

It is not a de Polignac number, because 102322721 - 2²² = 98128417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102322693 and 102322702.

It is not a weakly prime, because it can be changed into another prime (102322729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51161360 + 51161361.

It is an arithmetic number, because the mean of its divisors is an integer number (51161361).

Almost surely, 2^102322721 is an apocalyptic number.

It is an amenable number.

102322721 is a deficient number, since it is larger than the sum of its proper divisors (1).

102322721 is an equidigital number, since it uses as much as digits as its factorization.

102322721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 102322721 is about 10115.4693909873. The cubic root of 102322721 is about 467.7251183045.

Adding to 102322721 its reverse (127223201), we get a palindrome (229545922).

The spelling of 102322721 in words is "one hundred two million, three hundred twenty-two thousand, seven hundred twenty-one".