221240134430 has 64 divisors (see below), whose sum is σ = 469897003008. Its totient is φ = 73392324480.

The previous prime is 221240134411. The next prime is 221240134499. The reversal of 221240134430 is 34431042122.

It is a self number, because there is not a number n which added to its sum of digits gives 221240134430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21636299 + ... + 21646521.

It is an arithmetic number, because the mean of its divisors is an integer number (7342140672).

Almost surely, 2^221240134430 is an apocalyptic number.

221240134430 is an abundant number, since it is smaller than the sum of its proper divisors (248656868578).

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

221240134430 is a wasteful number, since it uses less digits than its factorization.

221240134430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20241.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 221240134430 its reverse (34431042122), we get a palindrome (255671176552).

The spelling of 221240134430 in words is "two hundred twenty-one billion, two hundred forty million, one hundred thirty-four thousand, four hundred thirty".