221630541654 has 32 divisors (see below), whose sum is σ = 445942949760. Its totient is φ = 73430784000.

The previous prime is 221630541623. The next prime is 221630541673. The reversal of 221630541654 is 456145036122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859729 + ... + 1087379.

It is an arithmetic number, because the mean of its divisors is an integer number (13935717180).

Almost surely, 2^221630541654 is an apocalyptic number.

221630541654 is an abundant number, since it is smaller than the sum of its proper divisors (224312408106).

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

221630541654 is a wasteful number, since it uses less digits than its factorization.

221630541654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228636.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 221630541654 its reverse (456145036122), we get a palindrome (677775577776).

The spelling of 221630541654 in words is "two hundred twenty-one billion, six hundred thirty million, five hundred forty-one thousand, six hundred fifty-four".