21321321032121 has 32 divisors (see below), whose sum is σ = 31681028302848. Its totient is φ = 12643742005440.

The previous prime is 21321321032029. The next prime is 21321321032131. The reversal of 21321321032121 is 12123012312312.

It is not a de Polignac number, because 21321321032121 - 2¹⁵ = 21321320999353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321321032091 and 21321321032100.

It is not an unprimeable number, because it can be changed into a prime (21321321032131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4078926 + ... + 7699368.

It is an arithmetic number, because the mean of its divisors is an integer number (990032134464).

Almost surely, 2^{21321321032121} is an apocalyptic number.

It is an amenable number.

21321321032121 is a deficient number, since it is larger than the sum of its proper divisors (10359707270727).

21321321032121 is a wasteful number, since it uses less digits than its factorization.

21321321032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624301.

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

Adding to 21321321032121 its reverse (12123012312312), we get a palindrome (33444333344433).

The spelling of 21321321032121 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twenty-one million, thirty-two thousand, one hundred twenty-one".