21214402430 has 64 divisors (see below), whose sum is σ = 41680977408. Its totient is φ = 7727076480.

The previous prime is 21214402423. The next prime is 21214402439. The reversal of 21214402430 is 3420441212.

It is a junction number, because it is equal to n+sod(n) for n = 21214402396 and 21214402405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214402439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11123537 + ... + 11125443.

It is an arithmetic number, because the mean of its divisors is an integer number (651265272).

Almost surely, 2^21214402430 is an apocalyptic number.

21214402430 is a deficient number, since it is larger than the sum of its proper divisors (20466574978).

21214402430 is a wasteful number, since it uses less digits than its factorization.

21214402430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21214402430 its reverse (3420441212), we get a palindrome (24634843642).

The spelling of 21214402430 in words is "twenty-one billion, two hundred fourteen million, four hundred two thousand, four hundred thirty".