206221211115225 has 24 divisors (see below), whose sum is σ = 341282462914272. Its totient is φ = 109878174787200.

The previous prime is 206221211115193. The next prime is 206221211115263. The reversal of 206221211115225 is 522511112122602.

It is not a de Polignac number, because 206221211115225 - 2⁵ = 206221211115193 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1330811271 + ... + 1330966220.

It is an arithmetic number, because the mean of its divisors is an integer number (14220102621428).

Almost surely, 2^{206221211115225} is an apocalyptic number.

206221211115225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206221211115225 is a deficient number, since it is larger than the sum of its proper divisors (135061251799047).

206221211115225 is a wasteful number, since it uses less digits than its factorization.

206221211115225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661778537 (or 2661778532 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 206221211115225 its reverse (522511112122602), we get a palindrome (728732323237827).

The spelling of 206221211115225 in words is "two hundred six trillion, two hundred twenty-one billion, two hundred eleven million, one hundred fifteen thousand, two hundred twenty-five".