21441023111551 has 8 divisors (see below), whose sum is σ = 22021012032320. Its totient is φ = 20861060601888.

The previous prime is 21441023111539. The next prime is 21441023111581. The reversal of 21441023111551 is 15511132014412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441023111551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441023111581) 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 in 7 ways as a sum of consecutive naturals, for example, 4951671 + ... + 8209816.

It is an arithmetic number, because the mean of its divisors is an integer number (2752626504040).

Almost surely, 2^{21441023111551} is an apocalyptic number.

21441023111551 is a deficient number, since it is larger than the sum of its proper divisors (579988920769).

21441023111551 is a wasteful number, since it uses less digits than its factorization.

21441023111551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13205553.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 21441023111551 its reverse (15511132014412), we get a palindrome (36952155125963).

The spelling of 21441023111551 in words is "twenty-one trillion, four hundred forty-one billion, twenty-three million, one hundred eleven thousand, five hundred fifty-one".