20551243521331 has 2 divisors, whose sum is σ = 20551243521332. Its totient is φ = 20551243521330.

The previous prime is 20551243521251. The next prime is 20551243521337. The reversal of 20551243521331 is 13312534215502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20551243521331 - 2³¹ = 20549096037683 is a prime.

It is a super-2 number, since 2×20551243521331² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20551243521337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275621760665 + 10275621760666.

It is an arithmetic number, because the mean of its divisors is an integer number (10275621760666).

Almost surely, 2^{20551243521331} is an apocalyptic number.

20551243521331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551243521331 is an equidigital number, since it uses as much as digits as its factorization.

20551243521331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 20551243521331 its reverse (13312534215502), we get a palindrome (33863777736833).

The spelling of 20551243521331 in words is "twenty trillion, five hundred fifty-one billion, two hundred forty-three million, five hundred twenty-one thousand, three hundred thirty-one".