21201212202001 has 8 divisors (see below), whose sum is σ = 22832110474880. Its totient is φ = 19570319042832.

The previous prime is 21201212201947. The next prime is 21201212202047. The reversal of 21201212202001 is 10020221210212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21201212202001 - 2¹³ = 21201212193809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201212202301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15181846 + ... + 16519408.

It is an arithmetic number, because the mean of its divisors is an integer number (2854013809360).

Almost surely, 2^{21201212202001} is an apocalyptic number.

It is an amenable number.

21201212202001 is a deficient number, since it is larger than the sum of its proper divisors (1630898272879).

21201212202001 is a wasteful number, since it uses less digits than its factorization.

21201212202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556855.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201212202001 its reverse (10020221210212), we get a palindrome (31221433412213).

The spelling of 21201212202001 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, two hundred two thousand, one".