221630445544 has 64 divisors (see below), whose sum is σ = 469809901440. Its totient is φ = 97441935360.

The previous prime is 221630445503. The next prime is 221630445571. The reversal of 221630445544 is 445544036122.

It is a junction number, because it is equal to n+sod(n) for n = 221630445497 and 221630445506.

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, 689377 + ... + 958384.

It is an arithmetic number, because the mean of its divisors is an integer number (7340779710).

Almost surely, 2^221630445544 is an apocalyptic number.

It is an amenable number.

221630445544 is an abundant number, since it is smaller than the sum of its proper divisors (248179455896).

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

221630445544 is a wasteful number, since it uses less digits than its factorization.

221630445544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647850 (or 1647846 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

The spelling of 221630445544 in words is "two hundred twenty-one billion, six hundred thirty million, four hundred forty-five thousand, five hundred forty-four".