21050351 has 6 divisors (see below), whose sum is σ = 24487200. Its totient is φ = 18043116.

The previous prime is 21050339. The next prime is 21050357. The reversal of 21050351 is 15305012.

It is not a de Polignac number, because 21050351 - 2⁶ = 21050287 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 (21050357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214751 + ... + 214848.

It is an arithmetic number, because the mean of its divisors is an integer number (4081200).

Almost surely, 2^21050351 is an apocalyptic number.

21050351 is a deficient number, since it is larger than the sum of its proper divisors (3436849).

21050351 is an equidigital number, since it uses as much as digits as its factorization.

21050351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429613 (or 429606 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 21050351 is about 4588.0661503514. The cubic root of 21050351 is about 276.1127409956.

Adding to 21050351 its reverse (15305012), we get a palindrome (36355363).

The spelling of 21050351 in words is "twenty-one million, fifty thousand, three hundred fifty-one".