21030350 has 24 divisors (see below), whose sum is σ = 42673608. Its totient is φ = 7647200.

The previous prime is 21030337. The next prime is 21030379. The reversal of 21030350 is 5303012.

It is a super-3 number, since 3×21030350³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18569 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (1778067).

Almost surely, 2^21030350 is an apocalyptic number.

21030350 is an abundant number, since it is smaller than the sum of its proper divisors (21643258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21030350 is a wasteful number, since it uses less digits than its factorization.

21030350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38260 (or 38255 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 21030350 is about 4585.8859558432. The cubic root of 21030350 is about 276.0252637380.

Adding to 21030350 its reverse (5303012), we get a palindrome (26333362).

The spelling of 21030350 in words is "twenty-one million, thirty thousand, three hundred fifty".