221199999940 has 24 divisors (see below), whose sum is σ = 488968421760. Its totient is φ = 83823157728.

The previous prime is 221199999893. The next prime is 221199999971. The reversal of 221199999940 is 49999991122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291052252 + ... + 291053011.

It is an arithmetic number, because the mean of its divisors is an integer number (20373684240).

Almost surely, 2^221199999940 is an apocalyptic number.

221199999940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221199999940 is an abundant number, since it is smaller than the sum of its proper divisors (267768421820).

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

221199999940 is a wasteful number, since it uses less digits than its factorization.

221199999940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582105291 (or 582105289 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 64.

The spelling of 221199999940 in words is "two hundred twenty-one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty".