221102021021 has 32 divisors (see below), whose sum is σ = 256330863360. Its totient is φ = 186803136000.

The previous prime is 221102021003. The next prime is 221102021033. The reversal of 221102021021 is 120120201122.

It is a de Polignac number, because none of the positive numbers 2^k-221102021021 is a prime.

It is a super-2 number, since 2×221102021021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102020987 and 221102021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102027021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273302465 + ... + 273303273.

It is an arithmetic number, because the mean of its divisors is an integer number (8010339480).

Almost surely, 2^221102021021 is an apocalyptic number.

It is an amenable number.

221102021021 is a deficient number, since it is larger than the sum of its proper divisors (35228842339).

221102021021 is a wasteful number, since it uses less digits than its factorization.

221102021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221102021021 its reverse (120120201122), we get a palindrome (341222222143).

The spelling of 221102021021 in words is "two hundred twenty-one billion, one hundred two million, twenty-one thousand, twenty-one".