21201222100001 has 4 divisors (see below), whose sum is σ = 21407059207872. Its totient is φ = 20995384992132.

The previous prime is 21201222099983. The next prime is 21201222100061. The reversal of 21201222100001 is 10000122210212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21201222100001 - 2³⁴ = 21184042230817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201222100061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102918553781 + ... + 102918553986.

It is an arithmetic number, because the mean of its divisors is an integer number (5351764801968).

Almost surely, 2^{21201222100001} is an apocalyptic number.

It is an amenable number.

21201222100001 is a deficient number, since it is larger than the sum of its proper divisors (205837107871).

21201222100001 is a wasteful number, since it uses less digits than its factorization.

21201222100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205837107870.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201222100001 its reverse (10000122210212), we get a palindrome (31201344310213).

The spelling of 21201222100001 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred thousand, one".