20401244204321 has 16 divisors (see below), whose sum is σ = 20593888809984. Its totient is φ = 20209591677504.

The previous prime is 20401244204293. The next prime is 20401244204329. The reversal of 20401244204321 is 12340244210402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20401244204321 - 2¹⁰ = 20401244203297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401244204329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52627415 + ... + 53013651.

It is an arithmetic number, because the mean of its divisors is an integer number (1287118050624).

Almost surely, 2^{20401244204321} is an apocalyptic number.

It is an amenable number.

20401244204321 is a deficient number, since it is larger than the sum of its proper divisors (192644605663).

20401244204321 is a wasteful number, since it uses less digits than its factorization.

20401244204321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387520.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20401244204321 its reverse (12340244210402), we get a palindrome (32741488414723).

The spelling of 20401244204321 in words is "twenty trillion, four hundred one billion, two hundred forty-four million, two hundred four thousand, three hundred twenty-one".