22201021212221 has 4 divisors (see below), whose sum is σ = 22202121218592. Its totient is φ = 22199921205852.

The previous prime is 22201021212211. The next prime is 22201021212241. The reversal of 22201021212221 is 12221212010222.

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 a cyclic number.

It is not a de Polignac number, because 22201021212221 - 2¹⁰ = 22201021211197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22201021212193 and 22201021212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201021212211) 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, 549972911 + ... + 550013276.

It is an arithmetic number, because the mean of its divisors is an integer number (5550530304648).

Almost surely, 2^{22201021212221} is an apocalyptic number.

It is an amenable number.

22201021212221 is a deficient number, since it is larger than the sum of its proper divisors (1100006371).

22201021212221 is a wasteful number, since it uses less digits than its factorization.

22201021212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100006370.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22201021212221 its reverse (12221212010222), we get a palindrome (34422233222443).

The spelling of 22201021212221 in words is "twenty-two trillion, two hundred one billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".