213121221001 has 16 divisors (see below), whose sum is σ = 236344163328. Its totient is φ = 190924099200.

The previous prime is 213121220947. The next prime is 213121221023. The reversal of 213121221001 is 100122121312.

It is a cyclic number.

It is not a de Polignac number, because 213121221001 - 2¹¹ = 213121218953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213121221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944931 + ... + 1148536.

It is an arithmetic number, because the mean of its divisors is an integer number (14771510208).

Almost surely, 2^213121221001 is an apocalyptic number.

It is an amenable number.

213121221001 is a deficient number, since it is larger than the sum of its proper divisors (23222942327).

213121221001 is a wasteful number, since it uses less digits than its factorization.

213121221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093712.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 213121221001 its reverse (100122121312), we get a palindrome (313243342313).

The spelling of 213121221001 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, one".