21120554141 has 4 divisors (see below), whose sum is σ = 21121093500. Its totient is φ = 21120014784.

The previous prime is 21120554137. The next prime is 21120554201. The reversal of 21120554141 is 14145502112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17421360100 + 3699194041 = 131990^2 + 60821^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120554141 - 2² = 21120554137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120554141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120554131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205916 + ... + 290933.

It is an arithmetic number, because the mean of its divisors is an integer number (5280273375).

Almost surely, 2^21120554141 is an apocalyptic number.

It is an amenable number.

21120554141 is a deficient number, since it is larger than the sum of its proper divisors (539359).

21120554141 is an equidigital number, since it uses as much as digits as its factorization.

21120554141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539358.

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 21120554141 in words is "twenty-one billion, one hundred twenty million, five hundred fifty-four thousand, one hundred forty-one".