21050443351 has 8 divisors (see below), whose sum is σ = 24062445440. Its totient is φ = 18039640248.

The previous prime is 21050443339. The next prime is 21050443357. The reversal of 21050443351 is 15334405012.

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

It is not a de Polignac number, because 21050443351 - 2⁹ = 21050442839 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 (21050443357) 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, 261801 + ... + 332626.

It is an arithmetic number, because the mean of its divisors is an integer number (3007805680).

Almost surely, 2^21050443351 is an apocalyptic number.

21050443351 is a deficient number, since it is larger than the sum of its proper divisors (3012002089).

21050443351 is an equidigital number, since it uses as much as digits as its factorization.

21050443351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599493.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21050443351 its reverse (15334405012), we get a palindrome (36384848363).

The spelling of 21050443351 in words is "twenty-one billion, fifty million, four hundred forty-three thousand, three hundred fifty-one".