20651121042321 has 384 divisors, whose sum is σ = 38552079237120. Its totient is φ = 9521309952000.

The previous prime is 20651121042311. The next prime is 20651121042337. The reversal of 20651121042321 is 12324012115602.

It is not a de Polignac number, because 20651121042321 - 2⁹ = 20651121041809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20651121042301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 18389243466 + ... + 18389244588.

It is an arithmetic number, because the mean of its divisors is an integer number (100396039680).

Almost surely, 2^{20651121042321} is an apocalyptic number.

20651121042321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20651121042321 is a deficient number, since it is larger than the sum of its proper divisors (17900958194799).

20651121042321 is a wasteful number, since it uses less digits than its factorization.

20651121042321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 20651121042321 its reverse (12324012115602), we get a palindrome (32975133157923).

The spelling of 20651121042321 in words is "twenty trillion, six hundred fifty-one billion, one hundred twenty-one million, forty-two thousand, three hundred twenty-one".