22001002111221 has 32 divisors (see below), whose sum is σ = 33667890278400. Its totient is φ = 12518550690240.

The previous prime is 22001002111217. The next prime is 22001002111223. The reversal of 22001002111221 is 12211120010022.

It is not a de Polignac number, because 22001002111221 - 2² = 22001002111217 is a prime.

It is a super-2 number, since 2×22001002111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22001002111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001002111223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78060370 + ... + 78341708.

It is an arithmetic number, because the mean of its divisors is an integer number (1052121571200).

Almost surely, 2^{22001002111221} is an apocalyptic number.

22001002111221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22001002111221 is a deficient number, since it is larger than the sum of its proper divisors (11666888167179).

22001002111221 is a wasteful number, since it uses less digits than its factorization.

22001002111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297169.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22001002111221 its reverse (12211120010022), we get a palindrome (34212122121243).

The spelling of 22001002111221 in words is "twenty-two trillion, one billion, two million, one hundred eleven thousand, two hundred twenty-one".