21212041430 has 32 divisors (see below), whose sum is σ = 38841855264. Its totient is φ = 8338934016.

The previous prime is 21212041423. The next prime is 21212041447. The reversal of 21212041430 is 3414021212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155252 + ... + 257928.

It is an arithmetic number, because the mean of its divisors is an integer number (1213807977).

Almost surely, 2^21212041430 is an apocalyptic number.

21212041430 is a deficient number, since it is larger than the sum of its proper divisors (17629813834).

21212041430 is a wasteful number, since it uses less digits than its factorization.

21212041430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103040.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21212041430 its reverse (3414021212), we get a palindrome (24626062642).

The spelling of 21212041430 in words is "twenty-one billion, two hundred twelve million, forty-one thousand, four hundred thirty".