21111254477641 has 8 divisors (see below), whose sum is σ = 21461769110600. Its totient is φ = 20762397124992.

The previous prime is 21111254477609. The next prime is 21111254477653. The reversal of 21111254477641 is 14677445211112.

It can be written as a sum of positive squares in 4 ways, for example, as 9457906787641 + 11653347690000 = 3075371^2 + 3413700^2 .

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 21111254477641 - 2⁵ = 21111254477609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111254477591 and 21111254477600.

It is not an unprimeable number, because it can be changed into a prime (21111954477641) 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 7 ways as a sum of consecutive naturals, for example, 414294390 + ... + 414345343.

It is an arithmetic number, because the mean of its divisors is an integer number (2682721138825).

Almost surely, 2^{21111254477641} is an apocalyptic number.

It is an amenable number.

21111254477641 is a deficient number, since it is larger than the sum of its proper divisors (350514632959).

21111254477641 is an equidigital number, since it uses as much as digits as its factorization.

21111254477641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828640155.

The product of its digits is 376320, while the sum is 46.

Adding to 21111254477641 its reverse (14677445211112), we get a palindrome (35788699688753).

The spelling of 21111254477641 in words is "twenty-one trillion, one hundred eleven billion, two hundred fifty-four million, four hundred seventy-seven thousand, six hundred forty-one".