21144461351 has 8 divisors (see below), whose sum is σ = 22972472880. Its totient is φ = 19345237632.

The previous prime is 21144461281. The next prime is 21144461357. The reversal of 21144461351 is 15316444112.

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 21144461351 - 2²² = 21140267047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144461357) 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 7 ways as a sum of consecutive naturals, for example, 7195421 + ... + 7198358.

It is an arithmetic number, because the mean of its divisors is an integer number (2871559110).

Almost surely, 2^21144461351 is an apocalyptic number.

21144461351 is a deficient number, since it is larger than the sum of its proper divisors (1828011529).

21144461351 is a wasteful number, since it uses less digits than its factorization.

21144461351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14393905.

The product of its digits is 11520, while the sum is 32.

The spelling of 21144461351 in words is "twenty-one billion, one hundred forty-four million, four hundred sixty-one thousand, three hundred fifty-one".