204121421331011 has 4 divisors (see below), whose sum is σ = 204239889946392. Its totient is φ = 204002952715632.

The previous prime is 204121421330993. The next prime is 204121421331041. The reversal of 204121421331011 is 110133124121402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204121421331011 is a prime.

It is a super-2 number, since 2×204121421331011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204121421331041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59234305106 + ... + 59234308551.

It is an arithmetic number, because the mean of its divisors is an integer number (51059972486598).

Almost surely, 2^{204121421331011} is an apocalyptic number.

204121421331011 is a deficient number, since it is larger than the sum of its proper divisors (118468615381).

204121421331011 is a wasteful number, since it uses less digits than its factorization.

204121421331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118468615380.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 204121421331011 its reverse (110133124121402), we get a palindrome (314254545452413).

The spelling of 204121421331011 in words is "two hundred four trillion, one hundred twenty-one billion, four hundred twenty-one million, three hundred thirty-one thousand, eleven".