22201222100021 has 4 divisors (see below), whose sum is σ = 22201392096000. Its totient is φ = 22201052104044.

The previous prime is 22201222100003. The next prime is 22201222100023. The reversal of 22201222100021 is 12000122210222.

It is a happy number.

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 22201222100021 - 2⁶ = 22201222099957 is a prime.

It is a super-2 number, since 2×22201222100021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201222100023) 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, 84801941 + ... + 85063338.

It is an arithmetic number, because the mean of its divisors is an integer number (5550348024000).

Almost surely, 2^{22201222100021} is an apocalyptic number.

It is an amenable number.

22201222100021 is a deficient number, since it is larger than the sum of its proper divisors (169995979).

22201222100021 is a wasteful number, since it uses less digits than its factorization.

22201222100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169995978.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22201222100021 its reverse (12000122210222), we get a palindrome (34201344310243).

The spelling of 22201222100021 in words is "twenty-two trillion, two hundred one billion, two hundred twenty-two million, one hundred thousand, twenty-one".