21256226443552 has 48 divisors (see below), whose sum is σ = 41884248268800. Its totient is φ = 10618959546880.

The previous prime is 21256226443519. The next prime is 21256226443561. The reversal of 21256226443552 is 25534462265212.

It is a super-3 number, since 3×21256226443552³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21256226443496 and 21256226443505.

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 in 7 ways as a sum of consecutive naturals, for example, 302454177 + ... + 302524447.

It is an arithmetic number, because the mean of its divisors is an integer number (872588505600).

Almost surely, 2^{21256226443552} is an apocalyptic number.

It is an amenable number.

21256226443552 is a deficient number, since it is larger than the sum of its proper divisors (20628021825248).

21256226443552 is a wasteful number, since it uses less digits than its factorization.

21256226443552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78289 (or 78281 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 49.

The spelling of 21256226443552 in words is "twenty-one trillion, two hundred fifty-six billion, two hundred twenty-six million, four hundred forty-three thousand, five hundred fifty-two".