204212121212440 has 64 divisors (see below), whose sum is σ = 502344756992160. Its totient is φ = 74096460856320.

The previous prime is 204212121212339. The next prime is 204212121212479. The reversal of 204212121212440 is 44212121212402.

It is a super-2 number, since 2×204212121212440² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204212121212399 and 204212121212408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507587167 + ... + 507989326.

Almost surely, 2^{204212121212440} is an apocalyptic number.

204212121212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204212121212440 is an abundant number, since it is smaller than the sum of its proper divisors (298132635779720).

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

204212121212440 is a wasteful number, since it uses less digits than its factorization.

204212121212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015576972 (or 1015576968 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 204212121212440 its reverse (44212121212402), we get a palindrome (248424242424842).

The spelling of 204212121212440 in words is "two hundred four trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, four hundred forty".