221002112121001 has 4 divisors (see below), whose sum is σ = 222615266224212. Its totient is φ = 219388958017792.

The previous prime is 221002112120971. The next prime is 221002112121019. The reversal of 221002112121001 is 100121211200122.

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 125362709509401 + 95639402611600 = 11196549^2 + 9779540^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002112121001 - 2¹⁹ = 221002111596713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221002112121061) 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, 806577051400 + ... + 806577051673.

It is an arithmetic number, because the mean of its divisors is an integer number (55653816556053).

Almost surely, 2^{221002112121001} is an apocalyptic number.

It is an amenable number.

221002112121001 is a deficient number, since it is larger than the sum of its proper divisors (1613154103211).

221002112121001 is a wasteful number, since it uses less digits than its factorization.

221002112121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613154103210.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221002112121001 its reverse (100121211200122), we get a palindrome (321123323321123).

The spelling of 221002112121001 in words is "two hundred twenty-one trillion, two billion, one hundred twelve million, one hundred twenty-one thousand, one".