21232202131221 has 16 divisors (see below), whose sum is σ = 28571370113088. Its totient is φ = 14024514067200.

The previous prime is 21232202131211. The next prime is 21232202131249. The reversal of 21232202131221 is 12213120223212.

It is not a de Polignac number, because 21232202131221 - 2⁹ = 21232202130709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232202131191 and 21232202131200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232202131211) 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, 74392615 + ... + 74677476.

It is an arithmetic number, because the mean of its divisors is an integer number (1785710632068).

Almost surely, 2^{21232202131221} is an apocalyptic number.

It is an amenable number.

21232202131221 is a deficient number, since it is larger than the sum of its proper divisors (7339167981867).

21232202131221 is a wasteful number, since it uses less digits than its factorization.

21232202131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149070532.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21232202131221 its reverse (12213120223212), we get a palindrome (33445322354433).

The spelling of 21232202131221 in words is "twenty-one trillion, two hundred thirty-two billion, two hundred two million, one hundred thirty-one thousand, two hundred twenty-one".