21212002212331 has 16 divisors (see below), whose sum is σ = 24286295577600. Its totient is φ = 18148722406848.

The previous prime is 21212002212299. The next prime is 21212002212337. The reversal of 21212002212331 is 13321220021212.

It is a cyclic number.

It is not a de Polignac number, because 21212002212331 - 2⁵ = 21212002212299 is a prime.

It is a super-2 number, since 2×21212002212331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212002212337) 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, 21348231 + ... + 22319743.

It is an arithmetic number, because the mean of its divisors is an integer number (1517893473600).

Almost surely, 2^{21212002212331} is an apocalyptic number.

21212002212331 is a deficient number, since it is larger than the sum of its proper divisors (3074293365269).

21212002212331 is an equidigital number, since it uses as much as digits as its factorization.

21212002212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977178.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21212002212331 its reverse (13321220021212), we get a palindrome (34533222233543).

The spelling of 21212002212331 in words is "twenty-one trillion, two hundred twelve billion, two million, two hundred twelve thousand, three hundred thirty-one".