21220311342232 has 16 divisors (see below), whose sum is σ = 39788157960000. Its totient is φ = 10610135886240.

The previous prime is 21220311342229. The next prime is 21220311342257. The reversal of 21220311342232 is 23224311302212.

It is a happy number.

It is a super-2 number, since 2×21220311342232² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220311342232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2728882 + ... + 7063102.

It is an arithmetic number, because the mean of its divisors is an integer number (2486759872500).

Almost surely, 2^{21220311342232} is an apocalyptic number.

It is an amenable number.

21220311342232 is a deficient number, since it is larger than the sum of its proper divisors (18567846617768).

21220311342232 is a wasteful number, since it uses less digits than its factorization.

21220311342232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4946226 (or 4946222 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21220311342232 its reverse (23224311302212), we get a palindrome (44444622644444).

The spelling of 21220311342232 in words is "twenty-one trillion, two hundred twenty billion, three hundred eleven million, three hundred forty-two thousand, two hundred thirty-two".