20215433551 has 2 divisors, whose sum is σ = 20215433552. Its totient is φ = 20215433550.

The previous prime is 20215433543. The next prime is 20215433561. The reversal of 20215433551 is 15533451202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20215433551 - 2³ = 20215433543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20215433561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107716775 + 10107716776.

It is an arithmetic number, because the mean of its divisors is an integer number (10107716776).

Almost surely, 2^20215433551 is an apocalyptic number.

20215433551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215433551 is an equidigital number, since it uses as much as digits as its factorization.

20215433551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 20215433551 its reverse (15533451202), we get a palindrome (35748884753).

The spelling of 20215433551 in words is "twenty billion, two hundred fifteen million, four hundred thirty-three thousand, five hundred fifty-one".