221012124 has 24 divisors (see below), whose sum is σ = 516821760. Its totient is φ = 73509744.

The previous prime is 221012119. The next prime is 221012149. The reversal of 221012124 is 421210122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14334 + ... + 25445.

It is an arithmetic number, because the mean of its divisors is an integer number (21534240).

Almost surely, 2^221012124 is an apocalyptic number.

It is an amenable number.

221012124 is an abundant number, since it is smaller than the sum of its proper divisors (295809636).

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

221012124 is a wasteful number, since it uses less digits than its factorization.

221012124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40249 (or 40247 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221012124 is about 14866.4765159738. The cubic root of 221012124 is about 604.6054153599.

Adding to 221012124 its reverse (421210122), we get a palindrome (642222246).

The spelling of 221012124 in words is "two hundred twenty-one million, twelve thousand, one hundred twenty-four".