221210101021 has 12 divisors (see below), whose sum is σ = 273754513632. Its totient is φ = 175023375696.

The previous prime is 221210101003. The next prime is 221210101037. The reversal of 221210101021 is 120101012122.

It is not a de Polignac number, because 221210101021 - 2⁵ = 221210100989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210100992 and 221210101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210101001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93494211 + ... + 93496576.

It is an arithmetic number, because the mean of its divisors is an integer number (22812876136).

Almost surely, 2^221210101021 is an apocalyptic number.

It is an amenable number.

221210101021 is a deficient number, since it is larger than the sum of its proper divisors (52544412611).

221210101021 is a wasteful number, since it uses less digits than its factorization.

221210101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186990820 (or 186990807 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221210101021 its reverse (120101012122), we get a palindrome (341311113143).

The spelling of 221210101021 in words is "two hundred twenty-one billion, two hundred ten million, one hundred one thousand, twenty-one".