221321121323001 has 16 divisors (see below), whose sum is σ = 337253746867200. Its totient is φ = 126468269293968.

The previous prime is 221321121322997. The next prime is 221321121323083. The reversal of 221321121323001 is 100323121123122.

It is not a de Polignac number, because 221321121323001 - 2² = 221321121322997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221321121323101) 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, 36398391 + ... + 42041468.

It is an arithmetic number, because the mean of its divisors is an integer number (21078359179200).

Almost surely, 2^{221321121323001} is an apocalyptic number.

221321121323001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221321121323001 is a deficient number, since it is larger than the sum of its proper divisors (115932625544199).

221321121323001 is a wasteful number, since it uses less digits than its factorization.

221321121323001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78574228.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221321121323001 its reverse (100323121123122), we get a palindrome (321644242446123).

The spelling of 221321121323001 in words is "two hundred twenty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, one".