12221070 has 16 divisors (see below), whose sum is σ = 29330640. Its totient is φ = 3258944.

The previous prime is 12221057. The next prime is 12221071. The reversal of 12221070 is 7012221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203655 + ... + 203714.

It is an arithmetic number, because the mean of its divisors is an integer number (1833165).

Almost surely, 2^12221070 is an apocalyptic number.

12221070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221070 is an abundant number, since it is smaller than the sum of its proper divisors (17109570).

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

12221070 is a wasteful number, since it uses less digits than its factorization.

12221070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407379.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 12221070 is about 3495.8646998990. The cubic root of 12221070 is about 230.3402022791.

Adding to 12221070 its reverse (7012221), we get a palindrome (19233291).

The spelling of 12221070 in words is "twelve million, two hundred twenty-one thousand, seventy".