102124721 has 2 divisors, whose sum is σ = 102124722. Its totient is φ = 102124720.

The previous prime is 102124717. The next prime is 102124739. The reversal of 102124721 is 127421201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95550625 + 6574096 = 9775^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 102124721 - 2² = 102124717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 102124693 and 102124702.

It is not a weakly prime, because it can be changed into another prime (102124751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51062360 + 51062361.

It is an arithmetic number, because the mean of its divisors is an integer number (51062361).

Almost surely, 2^102124721 is an apocalyptic number.

It is an amenable number.

102124721 is a deficient number, since it is larger than the sum of its proper divisors (1).

102124721 is an equidigital number, since it uses as much as digits as its factorization.

102124721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 102124721 is about 10105.6776615920. The cubic root of 102124721 is about 467.4232323641.

Adding to 102124721 its reverse (127421201), we get a palindrome (229545922).

The spelling of 102124721 in words is "one hundred two million, one hundred twenty-four thousand, seven hundred twenty-one".