12221895 has 64 divisors (see below), whose sum is σ = 24385536. Its totient is φ = 5099520.

The previous prime is 12221893. The next prime is 12221917. The reversal of 12221895 is 59812221.

12221895 = 46² + 47² + ... + 332².

It is not a de Polignac number, because 12221895 - 2¹ = 12221893 is a prime.

Its product of digits (2880) is a multiple of the sum of its prime divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221893) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73102 + ... + 73268.

It is an arithmetic number, because the mean of its divisors is an integer number (381024).

Almost surely, 2^12221895 is an apocalyptic number.

12221895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221895 is a deficient number, since it is larger than the sum of its proper divisors (12163641).

12221895 is a wasteful number, since it uses less digits than its factorization.

12221895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its digits is 2880, while the sum is 30.

The square root of 12221895 is about 3495.9826944652. The cubic root of 12221895 is about 230.3453853056.

The spelling of 12221895 in words is "twelve million, two hundred twenty-one thousand, eight hundred ninety-five".