221066692 has 48 divisors (see below), whose sum is σ = 486097920. Its totient is φ = 85456800.

The previous prime is 221066689. The next prime is 221066693. The reversal of 221066692 is 296660122.

221066692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221066692³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221066693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37609 + ... + 43087.

It is an arithmetic number, because the mean of its divisors is an integer number (10127040).

Almost surely, 2^221066692 is an apocalyptic number.

221066692 is a gapful number since it is divisible by the number (22) 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 221066692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243048960).

221066692 is an abundant number, since it is smaller than the sum of its proper divisors (265031228).

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

221066692 is a wasteful number, since it uses less digits than its factorization.

221066692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632 (or 5630 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 221066692 is about 14868.3116728161. The cubic root of 221066692 is about 604.6551703881.

The spelling of 221066692 in words is "two hundred twenty-one million, sixty-six thousand, six hundred ninety-two".