21011202001 has 2 divisors, whose sum is σ = 21011202002. Its totient is φ = 21011202000.

The previous prime is 21011201987. The next prime is 21011202007. The reversal of 21011202001 is 10020211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21010792401 + 409600 = 144951^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011202001 - 2⁷ = 21011201873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011202007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505601000 + 10505601001.

It is an arithmetic number, because the mean of its divisors is an integer number (10505601001).

Almost surely, 2^21011202001 is an apocalyptic number.

It is an amenable number.

21011202001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011202001 is an equidigital number, since it uses as much as digits as its factorization.

21011202001 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 21011202001 its reverse (10020211012), we get a palindrome (31031413013).

The spelling of 21011202001 in words is "twenty-one billion, eleven million, two hundred two thousand, one".