21101221202001 has 32 divisors (see below), whose sum is σ = 31275720483840. Its totient is φ = 12594062314944.

The previous prime is 21101221201987. The next prime is 21101221202059. The reversal of 21101221202001 is 10020212210112.

It is not a de Polignac number, because 21101221202001 - 2⁶ = 21101221201937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101221202401) 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, 96852126 + ... + 97069751.

It is an arithmetic number, because the mean of its divisors is an integer number (977366265120).

Almost surely, 2^{21101221202001} is an apocalyptic number.

It is an amenable number.

21101221202001 is a deficient number, since it is larger than the sum of its proper divisors (10174499281839).

21101221202001 is a wasteful number, since it uses less digits than its factorization.

21101221202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193922005.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101221202001 its reverse (10020212210112), we get a palindrome (31121433412113).

The spelling of 21101221202001 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred two thousand, one".