22021131321221 has 8 divisors (see below), whose sum is σ = 23368039133760. Its totient is φ = 20706679118752.

The previous prime is 22021131321131. The next prime is 22021131321257. The reversal of 22021131321221 is 12212313112022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021131321221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021131321421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8113901120 + ... + 8113903833.

It is an arithmetic number, because the mean of its divisors is an integer number (2921004891720).

Almost surely, 2^{22021131321221} is an apocalyptic number.

It is an amenable number.

22021131321221 is a deficient number, since it is larger than the sum of its proper divisors (1346907812539).

22021131321221 is a wasteful number, since it uses less digits than its factorization.

22021131321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16227805035.

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

Adding to 22021131321221 its reverse (12212313112022), we get a palindrome (34233444433243).

The spelling of 22021131321221 in words is "twenty-two trillion, twenty-one billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred twenty-one".