205421416 has 16 divisors (see below), whose sum is σ = 390442500. Its totient is φ = 101303424.

The previous prime is 205421401. The next prime is 205421423. The reversal of 205421416 is 614124502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 172817316 + 32604100 = 13146^2 + 5710^2 .

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, 175291 + ... + 176458.

Almost surely, 2^205421416 is an apocalyptic number.

It is an amenable number.

205421416 is a deficient number, since it is larger than the sum of its proper divisors (185021084).

205421416 is a wasteful number, since it uses less digits than its factorization.

205421416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351828 (or 351824 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 205421416 is about 14332.5299929915. The cubic root of 205421416 is about 590.0406138852.

Adding to 205421416 its reverse (614124502), we get a palindrome (819545918).

The spelling of 205421416 in words is "two hundred five million, four hundred twenty-one thousand, four hundred sixteen".