205415205221 has 8 divisors (see below), whose sum is σ = 206310808704. Its totient is φ = 204521073120.

The previous prime is 205415205199. The next prime is 205415205269. The reversal of 205415205221 is 122502514502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205415205221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205435205221) 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, 87560 + ... + 646913.

It is an arithmetic number, because the mean of its divisors is an integer number (25788851088).

Almost surely, 2^205415205221 is an apocalyptic number.

It is an amenable number.

205415205221 is a deficient number, since it is larger than the sum of its proper divisors (895603483).

205415205221 is an equidigital number, since it uses as much as digits as its factorization.

205415205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735691.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 205415205221 its reverse (122502514502), we get a palindrome (327917719723).

The spelling of 205415205221 in words is "two hundred five billion, four hundred fifteen million, two hundred five thousand, two hundred twenty-one".