102000021001 has 2 divisors, whose sum is σ = 102000021002. Its totient is φ = 102000021000.

The previous prime is 102000020959. The next prime is 102000021007. The reversal of 102000021001 is 100120000201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74815925625 + 27184095376 = 273525^2 + 164876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102000021001 is a prime.

It is not a weakly prime, because it can be changed into another prime (102000021007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51000010500 + 51000010501.

It is an arithmetic number, because the mean of its divisors is an integer number (51000010501).

Almost surely, 2^102000021001 is an apocalyptic number.

It is an amenable number.

102000021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

102000021001 is an equidigital number, since it uses as much as digits as its factorization.

102000021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 102000021001 its reverse (100120000201), we get a palindrome (202120021202).

The spelling of 102000021001 in words is "one hundred two billion, twenty-one thousand, one".