222121121222001 has 16 divisors (see below), whose sum is σ = 296225992433600. Its totient is φ = 148048501664448.

The previous prime is 222121121221981. The next prime is 222121121222069. The reversal of 222121121222001 is 100222121121222.

It is not a de Polignac number, because 222121121222001 - 2¹⁹ = 222121120697713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121121222081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313826430 + ... + 314533416.

It is an arithmetic number, because the mean of its divisors is an integer number (18514124527100).

Almost surely, 2^{222121121222001} is an apocalyptic number.

It is an amenable number.

222121121222001 is a deficient number, since it is larger than the sum of its proper divisors (74104871211599).

222121121222001 is a wasteful number, since it uses less digits than its factorization.

222121121222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729648.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222121121222001 its reverse (100222121121222), we get a palindrome (322343242343223).

The spelling of 222121121222001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, one".