204021404451321 has 32 divisors (see below), whose sum is σ = 283692692976000. Its totient is φ = 130260050339328.

The previous prime is 204021404451313. The next prime is 204021404451373. The reversal of 204021404451321 is 123154404120402.

It is not a de Polignac number, because 204021404451321 - 2³ = 204021404451313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204021404451301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5499885 + ... + 20935413.

It is an arithmetic number, because the mean of its divisors is an integer number (8865396655500).

Almost surely, 2^{204021404451321} is an apocalyptic number.

It is an amenable number.

204021404451321 is a deficient number, since it is larger than the sum of its proper divisors (79671288524679).

204021404451321 is a wasteful number, since it uses less digits than its factorization.

204021404451321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15436793.

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 204021404451321 its reverse (123154404120402), we get a palindrome (327175808571723).

The spelling of 204021404451321 in words is "two hundred four trillion, twenty-one billion, four hundred four million, four hundred fifty-one thousand, three hundred twenty-one".