21001211202201 has 8 divisors (see below), whose sum is σ = 29475384143520. Its totient is φ = 13263922864512.

The previous prime is 21001211202199. The next prime is 21001211202217. The reversal of 21001211202201 is 10220211210012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21001211202201 - 2¹ = 21001211202199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001211202701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184221150840 + ... + 184221150953.

It is an arithmetic number, because the mean of its divisors is an integer number (3684423017940).

Almost surely, 2^{21001211202201} is an apocalyptic number.

It is an amenable number.

21001211202201 is a deficient number, since it is larger than the sum of its proper divisors (8474172941319).

21001211202201 is a wasteful number, since it uses less digits than its factorization.

21001211202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368442301815.

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

Adding to 21001211202201 its reverse (10220211210012), we get a palindrome (31221422412213).

The spelling of 21001211202201 in words is "twenty-one trillion, one billion, two hundred eleven million, two hundred two thousand, two hundred one".