221958743700 has 36 divisors (see below), whose sum is σ = 642200632640. Its totient is φ = 59188998240.

The previous prime is 221958743693. The next prime is 221958743803. The reversal of 221958743700 is 7347859122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221958743700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369930940 + ... + 369931539.

Almost surely, 2^221958743700 is an apocalyptic number.

221958743700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221958743700 is an abundant number, since it is smaller than the sum of its proper divisors (420241888940).

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

221958743700 is a wasteful number, since it uses less digits than its factorization.

221958743700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739862496 (or 739862489 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 221958743700 in words is "two hundred twenty-one billion, nine hundred fifty-eight million, seven hundred forty-three thousand, seven hundred".