221541543040 has 32 divisors (see below), whose sum is σ = 529622752860. Its totient is φ = 88616616960.

The previous prime is 221541543031. The next prime is 221541543043. The reversal of 221541543040 is 40345145122.

It can be written as a sum of positive squares in 2 ways, for example, as 220081080384 + 1460462656 = 469128^2 + 38216^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 221541542993 and 221541543011.

It is not an unprimeable number, because it can be changed into a prime (221541543043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173078691 + ... + 173079970.

Almost surely, 2^221541543040 is an apocalyptic number.

221541543040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221541543040 is an abundant number, since it is smaller than the sum of its proper divisors (308081209820).

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

221541543040 is an equidigital number, since it uses as much as digits as its factorization.

221541543040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346158680 (or 346158668 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 221541543040 its reverse (40345145122), we get a palindrome (261886688162).

The spelling of 221541543040 in words is "two hundred twenty-one billion, five hundred forty-one million, five hundred forty-three thousand, forty".