204456421436421 has 48 divisors (see below), whose sum is σ = 343274036534784. Its totient is φ = 105159531480000.

The previous prime is 204456421436411. The next prime is 204456421436431. The reversal of 204456421436421 is 124634124654402.

It is an interprime number because it is at equal distance from previous prime (204456421436411) and next prime (204456421436431).

It is not a de Polignac number, because 204456421436421 - 2¹⁷ = 204456421305349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204456421436411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41026215 + ... + 45739076.

It is an arithmetic number, because the mean of its divisors is an integer number (7151542427808).

Almost surely, 2^{204456421436421} is an apocalyptic number.

204456421436421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204456421436421 is a deficient number, since it is larger than the sum of its proper divisors (138817615098363).

204456421436421 is a wasteful number, since it uses less digits than its factorization.

204456421436421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86765514 (or 86765413 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 48.

The spelling of 204456421436421 in words is "two hundred four trillion, four hundred fifty-six billion, four hundred twenty-one million, four hundred thirty-six thousand, four hundred twenty-one".