221001020121201 has 16 divisors (see below), whose sum is σ = 298706665610496. Its totient is φ = 145314722272896.

The previous prime is 221001020121199. The next prime is 221001020121209. The reversal of 221001020121201 is 102121020100122.

It is not a de Polignac number, because 221001020121201 - 2¹ = 221001020121199 is a prime.

It is a super-2 number, since 2×221001020121201² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221001020121209) 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, 28494511 + ... + 35411003.

It is an arithmetic number, because the mean of its divisors is an integer number (18669166600656).

Almost surely, 2^{221001020121201} is an apocalyptic number.

It is an amenable number.

221001020121201 is a deficient number, since it is larger than the sum of its proper divisors (77705645489295).

221001020121201 is a wasteful number, since it uses less digits than its factorization.

221001020121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062472.

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

Adding to 221001020121201 its reverse (102121020100122), we get a palindrome (323122040221323).

The spelling of 221001020121201 in words is "two hundred twenty-one trillion, one billion, twenty million, one hundred twenty-one thousand, two hundred one".