221959740 has 24 divisors (see below), whose sum is σ = 621487440. Its totient is φ = 59189248.

The previous prime is 221959687. The next prime is 221959741. The reversal of 221959740 is 47959122.

It is a super-2 number, since 2×221959740² = 98532252361735200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221959741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849605 + ... + 1849724.

It is an arithmetic number, because the mean of its divisors is an integer number (25895310).

Almost surely, 2^221959740 is an apocalyptic number.

221959740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221959740 is an abundant number, since it is smaller than the sum of its proper divisors (399527700).

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

221959740 is a wasteful number, since it uses less digits than its factorization.

221959740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699341 (or 3699339 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 221959740 is about 14898.3133273535. The cubic root of 221959740 is about 605.4682893946.

The spelling of 221959740 in words is "two hundred twenty-one million, nine hundred fifty-nine thousand, seven hundred forty".