221676387540 has 48 divisors (see below), whose sum is σ = 630869205120. Its totient is φ = 58144625280.

The previous prime is 221676387521. The next prime is 221676387553. The reversal of 221676387540 is 45783676122.

It is a happy number.

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, 30280000 + ... + 30287319.

It is an arithmetic number, because the mean of its divisors is an integer number (13143108440).

Almost surely, 2^221676387540 is an apocalyptic number.

221676387540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221676387540 is an abundant number, since it is smaller than the sum of its proper divisors (409192817580).

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

221676387540 is a wasteful number, since it uses less digits than its factorization.

221676387540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60567392 (or 60567390 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 221676387540 in words is "two hundred twenty-one billion, six hundred seventy-six million, three hundred eighty-seven thousand, five hundred forty".