21221112021332 has 6 divisors (see below), whose sum is σ = 37136946037338. Its totient is φ = 10610556010664.

The previous prime is 21221112021293. The next prime is 21221112021367. The reversal of 21221112021332 is 23312021112212.

It can be written as a sum of positive squares in only one way, i.e., 15266321241796 + 5954790779536 = 3907214^2 + 2440244^2 .

It is a super-4 number, since 4×21221112021332⁴ (a number of 54 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221112021298 and 21221112021307.

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 as a sum of consecutive naturals, namely, 2652639002663 + ... + 2652639002670.

It is an arithmetic number, because the mean of its divisors is an integer number (6189491006223).

Almost surely, 2^{21221112021332} is an apocalyptic number.

It is an amenable number.

21221112021332 is a deficient number, since it is larger than the sum of its proper divisors (15915834016006).

21221112021332 is a wasteful number, since it uses less digits than its factorization.

21221112021332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305278005337 (or 5305278005335 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21221112021332 its reverse (23312021112212), we get a palindrome (44533133133544).

The spelling of 21221112021332 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-one thousand, three hundred thirty-two".