21005051144510 has 16 divisors (see below), whose sum is σ = 37822648615200. Its totient is φ = 8399007890016.

The previous prime is 21005051144431. The next prime is 21005051144513. The reversal of 21005051144510 is 1544115050012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005051144513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376541690 + ... + 376597469.

It is an arithmetic number, because the mean of its divisors is an integer number (2363915538450).

Almost surely, 2^{21005051144510} is an apocalyptic number.

21005051144510 is a deficient number, since it is larger than the sum of its proper divisors (16817597470690).

21005051144510 is a wasteful number, since it uses less digits than its factorization.

21005051144510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753141955.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 21005051144510 its reverse (1544115050012), we get a palindrome (22549166194522).

The spelling of 21005051144510 in words is "twenty-one trillion, five billion, fifty-one million, one hundred forty-four thousand, five hundred ten".