22012102101221 has 4 divisors (see below), whose sum is σ = 22012284572652. Its totient is φ = 22011919629792.

The previous prime is 22012102101217. The next prime is 22012102101277. The reversal of 22012102101221 is 12210120121022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12712718940100 + 9299383161121 = 3565490^2 + 3049489^2 .

It is a cyclic number.

It is not a de Polignac number, because 22012102101221 - 2² = 22012102101217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22012102101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012102103221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91054646 + ... + 91296071.

It is an arithmetic number, because the mean of its divisors is an integer number (5503071143163).

Almost surely, 2^{22012102101221} is an apocalyptic number.

It is an amenable number.

22012102101221 is a deficient number, since it is larger than the sum of its proper divisors (182471431).

22012102101221 is a wasteful number, since it uses less digits than its factorization.

22012102101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182471430.

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

Adding to 22012102101221 its reverse (12210120121022), we get a palindrome (34222222222243).

The spelling of 22012102101221 in words is "twenty-two trillion, twelve billion, one hundred two million, one hundred one thousand, two hundred twenty-one".