21321212231001 has 16 divisors (see below), whose sum is σ = 29089690545344. Its totient is φ = 13883444172864.

The previous prime is 21321212230999. The next prime is 21321212231017. The reversal of 21321212231001 is 10013221212312.

It is not a de Polignac number, because 21321212231001 - 2¹ = 21321212230999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321212231801) 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, 13383975 + ... + 14892051.

It is an arithmetic number, because the mean of its divisors is an integer number (1818105659084).

Almost surely, 2^{21321212231001} is an apocalyptic number.

It is an amenable number.

21321212231001 is a deficient number, since it is larger than the sum of its proper divisors (7768478314343).

21321212231001 is a wasteful number, since it uses less digits than its factorization.

21321212231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617720.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21321212231001 its reverse (10013221212312), we get a palindrome (31334433443313).

The spelling of 21321212231001 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twelve million, two hundred thirty-one thousand, one".