21430402430 has 16 divisors (see below), whose sum is σ = 38579022144. Its totient is φ = 8571205920.

The previous prime is 21430402429. The next prime is 21430402439. The reversal of 21430402430 is 3420403412.

It is a junction number, because it is equal to n+sod(n) for n = 21430402396 and 21430402405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430402439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21302 + ... + 208121.

It is an arithmetic number, because the mean of its divisors is an integer number (2411188884).

Almost surely, 2^21430402430 is an apocalyptic number.

21430402430 is a deficient number, since it is larger than the sum of its proper divisors (17148619714).

21430402430 is a wasteful number, since it uses less digits than its factorization.

21430402430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238771.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21430402430 its reverse (3420403412), we get a palindrome (24850805842).

The spelling of 21430402430 in words is "twenty-one billion, four hundred thirty million, four hundred two thousand, four hundred thirty".