221102202021 has 8 divisors (see below), whose sum is σ = 297507550560. Its totient is φ = 146049160752.

The previous prime is 221102201963. The next prime is 221102202031. The reversal of 221102202021 is 120202201122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221102202021 - 2⁷ = 221102201893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102202031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338076435 + ... + 338077088.

It is an arithmetic number, because the mean of its divisors is an integer number (37188443820).

Almost surely, 2^221102202021 is an apocalyptic number.

It is an amenable number.

221102202021 is a deficient number, since it is larger than the sum of its proper divisors (76405348539).

221102202021 is a wasteful number, since it uses less digits than its factorization.

221102202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676153635.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221102202021 its reverse (120202201122), we get a palindrome (341304403143).

The spelling of 221102202021 in words is "two hundred twenty-one billion, one hundred two million, two hundred two thousand, twenty-one".