204157762221 has 16 divisors (see below), whose sum is σ = 316197504128. Its totient is φ = 114749092800.

The previous prime is 204157762217. The next prime is 204157762223. The reversal of 204157762221 is 122267751402.

It is a happy number.

It is not a de Polignac number, because 204157762221 - 2² = 204157762217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204157762221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204157762223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79685590 + ... + 79688151.

It is an arithmetic number, because the mean of its divisors is an integer number (19762344008).

Almost surely, 2^204157762221 is an apocalyptic number.

204157762221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204157762221 is a deficient number, since it is larger than the sum of its proper divisors (112039741907).

204157762221 is a wasteful number, since it uses less digits than its factorization.

204157762221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159373812.

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 204157762221 in words is "two hundred four billion, one hundred fifty-seven million, seven hundred sixty-two thousand, two hundred twenty-one".