221650992 has 140 divisors (see below), whose sum is σ = 665733184. Its totient is φ = 71383680.

The previous prime is 221650991. The next prime is 221650997. The reversal of 221650992 is 299056122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (221650991) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 361278 + ... + 361890.

Almost surely, 2^221650992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221650992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332866592).

221650992 is an abundant number, since it is smaller than the sum of its proper divisors (444082192).

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

221650992 is an equidigital number, since it uses as much as digits as its factorization.

221650992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 221650992 is about 14887.9478773940. The cubic root of 221650992 is about 605.1874218410.

The spelling of 221650992 in words is "two hundred twenty-one million, six hundred fifty thousand, nine hundred ninety-two".