221101202221 has 4 divisors (see below), whose sum is σ = 221249295612. Its totient is φ = 220953108832.

The previous prime is 221101202183. The next prime is 221101202261. The reversal of 221101202221 is 122202101122.

It is a happy number.

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 203526397321 + 17574804900 = 451139^2 + 132570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221101202221 is a prime.

It is a super-3 number, since 3×221101202221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101202195 and 221101202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101202261) 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, 74044456 + ... + 74047441.

It is an arithmetic number, because the mean of its divisors is an integer number (55312323903).

Almost surely, 2^221101202221 is an apocalyptic number.

It is an amenable number.

221101202221 is a deficient number, since it is larger than the sum of its proper divisors (148093391).

221101202221 is a wasteful number, since it uses less digits than its factorization.

221101202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148093390.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221101202221 its reverse (122202101122), we get a palindrome (343303303343).

The spelling of 221101202221 in words is "two hundred twenty-one billion, one hundred one million, two hundred two thousand, two hundred twenty-one".