21212210222302 has 16 divisors (see below), whose sum is σ = 34711011501552. Its totient is φ = 9641879835520.

The previous prime is 21212210222263. The next prime is 21212210222369. The reversal of 21212210222302 is 20322201221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5355798 + ... + 8432614.

It is an arithmetic number, because the mean of its divisors is an integer number (2169438218847).

Almost surely, 2^{21212210222302} is an apocalyptic number.

21212210222302 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212210222302 is a deficient number, since it is larger than the sum of its proper divisors (13498801279250).

21212210222302 is a wasteful number, since it uses less digits than its factorization.

21212210222302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390203.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21212210222302 its reverse (20322201221212), we get a palindrome (41534411443514).

The spelling of 21212210222302 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-two thousand, three hundred two".