21031222220331 has 64 divisors (see below), whose sum is σ = 31660554240000. Its totient is φ = 12338952417792.

The previous prime is 21031222220329. The next prime is 21031222220389. The reversal of 21031222220331 is 13302222213012.

It is not a de Polignac number, because 21031222220331 - 2¹ = 21031222220329 is a prime.

It is a super-2 number, since 2×21031222220331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031222220731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 224936650 + ... + 225030128.

It is an arithmetic number, because the mean of its divisors is an integer number (494696160000).

Almost surely, 2^{21031222220331} is an apocalyptic number.

21031222220331 is a deficient number, since it is larger than the sum of its proper divisors (10629332019669).

21031222220331 is a wasteful number, since it uses less digits than its factorization.

21031222220331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96536.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21031222220331 its reverse (13302222213012), we get a palindrome (34333444433343).

The spelling of 21031222220331 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-two million, two hundred twenty thousand, three hundred thirty-one".