204221215016 has 128 divisors (see below), whose sum is σ = 508418830080. Its totient is φ = 74603483136.

The previous prime is 204221215007. The next prime is 204221215021. The reversal of 204221215016 is 610512122402.

It is a super-2 number, since 2×204221215016² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500255 + ... + 811601.

It is an arithmetic number, because the mean of its divisors is an integer number (3972022110).

Almost surely, 2^204221215016 is an apocalyptic number.

204221215016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204221215016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254209415040).

204221215016 is an abundant number, since it is smaller than the sum of its proper divisors (304197615064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204221215016 is a wasteful number, since it uses less digits than its factorization.

204221215016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311443 (or 311439 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 204221215016 its reverse (610512122402), we get a palindrome (814733337418).

The spelling of 204221215016 in words is "two hundred four billion, two hundred twenty-one million, two hundred fifteen thousand, sixteen".