20551243521211 has 8 divisors (see below), whose sum is σ = 22155479179344. Its totient is φ = 18950346544800.

The previous prime is 20551243521209. The next prime is 20551243521241. The reversal of 20551243521211 is 11212534215502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20551243521211 - 2¹ = 20551243521209 is a prime.

It is a super-2 number, since 2×20551243521211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551243521241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834657640 + ... + 834682261.

It is an arithmetic number, because the mean of its divisors is an integer number (2769434897418).

Almost surely, 2^{20551243521211} is an apocalyptic number.

20551243521211 is a deficient number, since it is larger than the sum of its proper divisors (1604235658133).

20551243521211 is a wasteful number, since it uses less digits than its factorization.

20551243521211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669340861.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 20551243521211 its reverse (11212534215502), we get a palindrome (31763777736713).

The spelling of 20551243521211 in words is "twenty trillion, five hundred fifty-one billion, two hundred forty-three million, five hundred twenty-one thousand, two hundred eleven".