210021424 has 20 divisors (see below), whose sum is σ = 410124544. Its totient is φ = 104182848.

The previous prime is 210021391. The next prime is 210021431. The reversal of 210021424 is 424120012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 210021398 and 210021407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49647 + ... + 53710.

Almost surely, 2^210021424 is an apocalyptic number.

It is an amenable number.

210021424 is a deficient number, since it is larger than the sum of its proper divisors (200103120).

210021424 is a wasteful number, since it uses less digits than its factorization.

210021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103492 (or 103486 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 210021424 is about 14492.1159255645. The cubic root of 210021424 is about 594.4124076975.

Adding to 210021424 its reverse (424120012), we get a palindrome (634141436).

The spelling of 210021424 in words is "two hundred ten million, twenty-one thousand, four hundred twenty-four".