21202111222001 has 8 divisors (see below), whose sum is σ = 21358725894240. Its totient is φ = 21045554857152.

The previous prime is 21202111221997. The next prime is 21202111222021. The reversal of 21202111222001 is 10022211120212.

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 21202111222001 - 2² = 21202111221997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202111222021) 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, 13846775 + ... + 15301548.

It is an arithmetic number, because the mean of its divisors is an integer number (2669840736780).

Almost surely, 2^{21202111222001} is an apocalyptic number.

It is an amenable number.

21202111222001 is a deficient number, since it is larger than the sum of its proper divisors (156614672239).

21202111222001 is a wasteful number, since it uses less digits than its factorization.

21202111222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29153695.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21202111222001 its reverse (10022211120212), we get a palindrome (31224322342213).

The spelling of 21202111222001 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, two hundred twenty-two thousand, one".