20152221060551 has 4 divisors (see below), whose sum is σ = 20152442772504. Its totient is φ = 20151999348600.

The previous prime is 20152221060527. The next prime is 20152221060571. The reversal of 20152221060551 is 15506012225102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20152221060551 - 2¹⁸ = 20152220798407 is a prime.

It is a super-2 number, since 2×20152221060551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20152221060571) 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 3 ways as a sum of consecutive naturals, for example, 110719580 + ... + 110901441.

It is an arithmetic number, because the mean of its divisors is an integer number (5038110693126).

Almost surely, 2^{20152221060551} is an apocalyptic number.

20152221060551 is a deficient number, since it is larger than the sum of its proper divisors (221711953).

20152221060551 is an equidigital number, since it uses as much as digits as its factorization.

20152221060551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221711952.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 20152221060551 its reverse (15506012225102), we get a palindrome (35658233285653).

The spelling of 20152221060551 in words is "twenty trillion, one hundred fifty-two billion, two hundred twenty-one million, sixty thousand, five hundred fifty-one".