21210102001 has 32 divisors (see below), whose sum is σ = 24098570496. Its totient is φ = 18498816000.

The previous prime is 21210101977. The next prime is 21210102007. The reversal of 21210102001 is 10020101212.

It is a cyclic number.

It is not a de Polignac number, because 21210102001 - 2³¹ = 19062618353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210102007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18987895 + ... + 18989011.

It is an arithmetic number, because the mean of its divisors is an integer number (753080328).

Almost surely, 2^21210102001 is an apocalyptic number.

It is an amenable number.

21210102001 is a deficient number, since it is larger than the sum of its proper divisors (2888468495).

21210102001 is a wasteful number, since it uses less digits than its factorization.

21210102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

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

Adding to 21210102001 its reverse (10020101212), we get a palindrome (31230203213).

The spelling of 21210102001 in words is "twenty-one billion, two hundred ten million, one hundred two thousand, one".