101021002009 has 2 divisors, whose sum is σ = 101021002010. Its totient is φ = 101021002008.

The previous prime is 101021002001. The next prime is 101021002021. The reversal of 101021002009 is 900200120101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100359072025 + 661929984 = 316795^2 + 25728^2 .

It is a cyclic number.

It is not a de Polignac number, because 101021002009 - 2³ = 101021002001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101021001983 and 101021002001.

It is not a weakly prime, because it can be changed into another prime (101021002001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50510501004 + 50510501005.

It is an arithmetic number, because the mean of its divisors is an integer number (50510501005).

Almost surely, 2^101021002009 is an apocalyptic number.

It is an amenable number.

101021002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

101021002009 is an equidigital number, since it uses as much as digits as its factorization.

101021002009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 101021002009 in words is "one hundred one billion, twenty-one million, two thousand, nine".