21220131033321 has 16 divisors (see below), whose sum is σ = 30871584516288. Its totient is φ = 12858210734400.

The previous prime is 21220131033293. The next prime is 21220131033433. The reversal of 21220131033321 is 12333013102212.

It is not a de Polignac number, because 21220131033321 - 2⁵ = 21220131033289 is a prime.

It is a super-2 number, since 2×21220131033321² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220131033291 and 21220131033300.

It is not an unprimeable number, because it can be changed into a prime (21220131033121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61694410 + ... + 62037411.

It is an arithmetic number, because the mean of its divisors is an integer number (1929474032268).

Almost surely, 2^{21220131033321} is an apocalyptic number.

It is an amenable number.

21220131033321 is a deficient number, since it is larger than the sum of its proper divisors (9651453482967).

21220131033321 is a wasteful number, since it uses less digits than its factorization.

21220131033321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123737032.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21220131033321 its reverse (12333013102212), we get a palindrome (33553144135533).

The spelling of 21220131033321 in words is "twenty-one trillion, two hundred twenty billion, one hundred thirty-one million, thirty-three thousand, three hundred twenty-one".