221302102021 has 48 divisors (see below), whose sum is σ = 305434257408. Its totient is φ = 157601808000.

The previous prime is 221302102001. The next prime is 221302102031. The reversal of 221302102021 is 120201203122.

It is a happy number.

It is not a de Polignac number, because 221302102021 - 2²³ = 221293713413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221302101986 and 221302102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221302102001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 551356 + ... + 864058.

It is an arithmetic number, because the mean of its divisors is an integer number (6363213696).

Almost surely, 2^221302102021 is an apocalyptic number.

It is an amenable number.

221302102021 is a deficient number, since it is larger than the sum of its proper divisors (84132155387).

221302102021 is a wasteful number, since it uses less digits than its factorization.

221302102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312842 (or 312835 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221302102021 its reverse (120201203122), we get a palindrome (341503305143).

It can be divided in two parts, 221302 and 102021, that added together give a palindrome (323323).

The spelling of 221302102021 in words is "two hundred twenty-one billion, three hundred two million, one hundred two thousand, twenty-one".