221969740 has 48 divisors (see below), whose sum is σ = 472695552. Its totient is φ = 87549696.

The previous prime is 221969707. The next prime is 221969753. The reversal of 221969740 is 47969122.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221969693 and 221969702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700062 + ... + 700378.

It is an arithmetic number, because the mean of its divisors is an integer number (9847824).

Almost surely, 2^221969740 is an apocalyptic number.

221969740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221969740 is an abundant number, since it is smaller than the sum of its proper divisors (250725812).

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

221969740 is a wasteful number, since it uses less digits than its factorization.

221969740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 221969740 is about 14898.6489320341. The cubic root of 221969740 is about 605.4773820225.

The spelling of 221969740 in words is "two hundred twenty-one million, nine hundred sixty-nine thousand, seven hundred forty".