210021421424 has 20 divisors (see below), whose sum is σ = 406986042744. Its totient is φ = 104992765248.

The previous prime is 210021421417. The next prime is 210021421439. The reversal of 210021421424 is 424124120012.

It is a self number, because there is not a number n which added to its sum of digits gives 210021421424.

It is a congruent number.

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, 1024787 + ... + 1212530.

Almost surely, 2^210021421424 is an apocalyptic number.

It is an amenable number.

210021421424 is a deficient number, since it is larger than the sum of its proper divisors (196964621320).

210021421424 is a wasteful number, since it uses less digits than its factorization.

210021421424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243192 (or 2243186 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 210021421424 its reverse (424124120012), we get a palindrome (634145541436).

The spelling of 210021421424 in words is "two hundred ten billion, twenty-one million, four hundred twenty-one thousand, four hundred twenty-four".