221926830 has 64 divisors (see below), whose sum is σ = 557715456. Its totient is φ = 56448000.

The previous prime is 221926819. The next prime is 221926849. The reversal of 221926830 is 38629122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221926791 and 221926800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64350 + ... + 67710.

It is an arithmetic number, because the mean of its divisors is an integer number (8714304).

Almost surely, 2^221926830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221926830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278857728).

221926830 is an abundant number, since it is smaller than the sum of its proper divisors (335788626).

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

221926830 is a wasteful number, since it uses less digits than its factorization.

221926830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 221926830 is about 14897.2087989663. The cubic root of 221926830 is about 605.4383636277.

The spelling of 221926830 in words is "two hundred twenty-one million, nine hundred twenty-six thousand, eight hundred thirty".