21031011032221 has 16 divisors (see below), whose sum is σ = 22543720416000. Its totient is φ = 19549077388288.

The previous prime is 21031011032191. The next prime is 21031011032233. The reversal of 21031011032221 is 12223011013012.

It is a cyclic number.

It is not a de Polignac number, because 21031011032221 - 2¹¹ = 21031011030173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031011032261) 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, 1945980 + ... + 6771178.

It is an arithmetic number, because the mean of its divisors is an integer number (1408982526000).

Almost surely, 2^{21031011032221} is an apocalyptic number.

It is an amenable number.

21031011032221 is a deficient number, since it is larger than the sum of its proper divisors (1512709383779).

21031011032221 is a wasteful number, since it uses less digits than its factorization.

21031011032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4828388.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21031011032221 its reverse (12223011013012), we get a palindrome (33254022045233).

The spelling of 21031011032221 in words is "twenty-one trillion, thirty-one billion, eleven million, thirty-two thousand, two hundred twenty-one".