221020320302121 has 8 divisors (see below), whose sum is σ = 298730661230560. Its totient is φ = 145328429787552.

The previous prime is 221020320302101. The next prime is 221020320302209. The reversal of 221020320302121 is 121203023020122.

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

It is not a de Polignac number, because 221020320302121 - 2⁹ = 221020320301609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020320302101) 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, 504612603211 + ... + 504612603648.

It is an arithmetic number, because the mean of its divisors is an integer number (37341332653820).

Almost surely, 2^{221020320302121} is an apocalyptic number.

It is an amenable number.

221020320302121 is a deficient number, since it is larger than the sum of its proper divisors (77710340928439).

221020320302121 is a wasteful number, since it uses less digits than its factorization.

221020320302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009225206935.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221020320302121 its reverse (121203023020122), we get a palindrome (342223343322243).

The spelling of 221020320302121 in words is "two hundred twenty-one trillion, twenty billion, three hundred twenty million, three hundred two thousand, one hundred twenty-one".