221436436 has 12 divisors (see below), whose sum is σ = 417322612. Its totient is φ = 102201408.

The previous prime is 221436421. The next prime is 221436451. The reversal of 221436436 is 634634122.

It is an interprime number because it is at equal distance from previous prime (221436421) and next prime (221436451).

It can be written as a sum of positive squares in 2 ways, for example, as 43480836 + 177955600 = 6594^2 + 13340^2 .

It is a super-3 number, since 3×221436436³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221436398 and 221436407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2129145 + ... + 2129248.

Almost surely, 2^221436436 is an apocalyptic number.

221436436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221436436 is a deficient number, since it is larger than the sum of its proper divisors (195886176).

221436436 is a wasteful number, since it uses less digits than its factorization.

221436436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258410 (or 4258408 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 221436436 is about 14880.7404385669. The cubic root of 221436436 is about 604.9920869580.

The spelling of 221436436 in words is "two hundred twenty-one million, four hundred thirty-six thousand, four hundred thirty-six".