221523553240 has 32 divisors (see below), whose sum is σ = 543739631760. Its totient is φ = 80554019200.

The previous prime is 221523553171. The next prime is 221523553241. The reversal of 221523553240 is 42355325122.

It is a super-2 number, since 2×221523553240² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221523553196 and 221523553205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221523553241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251730871 + ... + 251731750.

Almost surely, 2^221523553240 is an apocalyptic number.

221523553240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221523553240 is an abundant number, since it is smaller than the sum of its proper divisors (322216078520).

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

221523553240 is a wasteful number, since it uses less digits than its factorization.

221523553240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503462643 (or 503462639 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 221523553240 its reverse (42355325122), we get a palindrome (263878878362).

The spelling of 221523553240 in words is "two hundred twenty-one billion, five hundred twenty-three million, five hundred fifty-three thousand, two hundred forty".