21222223355421 has 32 divisors (see below), whose sum is σ = 34638132378240. Its totient is φ = 12734607456000.

The previous prime is 21222223355413. The next prime is 21222223355539. The reversal of 21222223355421 is 12455332222212.

21222223355421 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 223 + 3 + 5 + 5 + 421 = 666.

It is not a de Polignac number, because 21222223355421 - 2³ = 21222223355413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222223355821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353709100 + ... + 353769093.

It is an arithmetic number, because the mean of its divisors is an integer number (1082441636820).

Almost surely, 2^{21222223355421} is an apocalyptic number.

It is an amenable number.

21222223355421 is a deficient number, since it is larger than the sum of its proper divisors (13415909022819).

21222223355421 is a wasteful number, since it uses less digits than its factorization.

21222223355421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707478314 (or 707478308 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 21222223355421 its reverse (12455332222212), we get a palindrome (33677555577633).

The spelling of 21222223355421 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, three hundred fifty-five thousand, four hundred twenty-one".