221012040 has 64 divisors (see below), whose sum is σ = 667316160. Its totient is φ = 58556160.

The previous prime is 221012039. The next prime is 221012069. The reversal of 221012040 is 40210122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12975 + ... + 24705.

It is an arithmetic number, because the mean of its divisors is an integer number (10426815).

Almost surely, 2^221012040 is an apocalyptic number.

221012040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221012040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333658080).

221012040 is an abundant number, since it is smaller than the sum of its proper divisors (446304120).

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

221012040 is a wasteful number, since it uses less digits than its factorization.

221012040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11902 (or 11898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221012040 is about 14866.4736908253. The cubic root of 221012040 is about 604.6053387625.

Adding to 221012040 its reverse (40210122), we get a palindrome (261222162).

The spelling of 221012040 in words is "two hundred twenty-one million, twelve thousand, forty".