221102112122021 has 16 divisors (see below), whose sum is σ = 253247002573824. Its totient is φ = 191227328388864.

The previous prime is 221102112121993. The next prime is 221102112122029. The reversal of 221102112122021 is 120221211201122.

It is a de Polignac number, because none of the positive numbers 2^k-221102112122021 is a prime.

It is a super-2 number, since 2×221102112122021² (a number of 29 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 = 221102112121984 and 221102112122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102112122029) 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, 2243139161 + ... + 2243237726.

It is an arithmetic number, because the mean of its divisors is an integer number (15827937660864).

Almost surely, 2^{221102112122021} is an apocalyptic number.

It is an amenable number.

221102112122021 is a deficient number, since it is larger than the sum of its proper divisors (32144890451803).

221102112122021 is a wasteful number, since it uses less digits than its factorization.

221102112122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486377140.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221102112122021 its reverse (120221211201122), we get a palindrome (341323323323143).

The spelling of 221102112122021 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred twelve million, one hundred twenty-two thousand, twenty-one".