221526809052 has 24 divisors (see below), whose sum is σ = 518722382976. Its totient is φ = 73581341808.

The previous prime is 221526809047. The next prime is 221526809219. The reversal of 221526809052 is 250908625122.

221526809052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221526809052² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221526808995 and 221526809013.

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 in 7 ways as a sum of consecutive naturals, for example, 32612448 + ... + 32619239.

It is an arithmetic number, because the mean of its divisors is an integer number (21613432624).

Almost surely, 2^221526809052 is an apocalyptic number.

It is an amenable number.

221526809052 is an abundant number, since it is smaller than the sum of its proper divisors (297195573924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221526809052 is a wasteful number, since it uses less digits than its factorization.

221526809052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65231977 (or 65231975 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 221526809052 in words is "two hundred twenty-one billion, five hundred twenty-six million, eight hundred nine thousand, fifty-two".