21220202334 has 32 divisors (see below), whose sum is σ = 43783004160. Its totient is φ = 6851349792.

The previous prime is 21220202329. The next prime is 21220202359. The reversal of 21220202334 is 43320202212.

It is a self number, because there is not a number n which added to its sum of digits gives 21220202334.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164814 + ... + 263825.

It is an arithmetic number, because the mean of its divisors is an integer number (1368218880).

Almost surely, 2^21220202334 is an apocalyptic number.

21220202334 is an abundant number, since it is smaller than the sum of its proper divisors (22562801826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220202334 is a wasteful number, since it uses less digits than its factorization.

21220202334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428904.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21220202334 its reverse (43320202212), we get a palindrome (64540404546).

It can be divided in two parts, 212 and 20202334, that added together give a triangular number (20202546 = T₆₃₅₆).

The spelling of 21220202334 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred thirty-four".