221601012 has 12 divisors (see below), whose sum is σ = 517069056. Its totient is φ = 73867000.

The previous prime is 221600999. The next prime is 221601049. The reversal of 221601012 is 210106122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221600982 and 221601000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9233364 + ... + 9233387.

It is an arithmetic number, because the mean of its divisors is an integer number (43089088).

Almost surely, 2^221601012 is an apocalyptic number.

It is an amenable number.

221601012 is an abundant number, since it is smaller than the sum of its proper divisors (295468044).

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

221601012 is a wasteful number, since it uses less digits than its factorization.

221601012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18466758 (or 18466756 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 221601012 is about 14886.2692438368. The cubic root of 221601012 is about 605.1419305924.

Adding to 221601012 its reverse (210106122), we get a palindrome (431707134).

The spelling of 221601012 in words is "two hundred twenty-one million, six hundred one thousand, twelve".