21004010101 has 2 divisors, whose sum is σ = 21004010102. Its totient is φ = 21004010100.

The previous prime is 21004010063. The next prime is 21004010117. The reversal of 21004010101 is 10101040012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16329006225 + 4675003876 = 127785^2 + 68374^2 .

It is a cyclic number.

It is not a de Polignac number, because 21004010101 - 2⁷ = 21004009973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004010141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502005050 + 10502005051.

It is an arithmetic number, because the mean of its divisors is an integer number (10502005051).

Almost surely, 2^21004010101 is an apocalyptic number.

It is an amenable number.

21004010101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004010101 is an equidigital number, since it uses as much as digits as its factorization.

21004010101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21004010101 its reverse (10101040012), we get a palindrome (31105050113).

The spelling of 21004010101 in words is "twenty-one billion, four million, ten thousand, one hundred one".