21221523051226 has 32 divisors (see below), whose sum is σ = 33636426275520. Its totient is φ = 10013693155200.

The previous prime is 21221523051199. The next prime is 21221523051251. The reversal of 21221523051226 is 62215032512212.

It is a super-2 number, since 2×21221523051226² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221523051191 and 21221523051200.

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 15 ways as a sum of consecutive naturals, for example, 37702281 + ... + 38261011.

It is an arithmetic number, because the mean of its divisors is an integer number (1051138321110).

Almost surely, 2^{21221523051226} is an apocalyptic number.

21221523051226 is a deficient number, since it is larger than the sum of its proper divisors (12414903224294).

21221523051226 is a wasteful number, since it uses less digits than its factorization.

21221523051226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562590.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21221523051226 its reverse (62215032512212), we get a palindrome (83436555563438).

The spelling of 21221523051226 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-three million, fifty-one thousand, two hundred twenty-six".