21434400502 has 4 divisors (see below), whose sum is σ = 32151600756. Its totient is φ = 10717200250.

The previous prime is 21434400469. The next prime is 21434400523. The reversal of 21434400502 is 20500443412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358600124 + ... + 5358600127.

It is an arithmetic number, because the mean of its divisors is an integer number (8037900189).

Almost surely, 2^21434400502 is an apocalyptic number.

21434400502 is a deficient number, since it is larger than the sum of its proper divisors (10717200254).

21434400502 is a wasteful number, since it uses less digits than its factorization.

21434400502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717200253.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21434400502 its reverse (20500443412), we get a palindrome (41934843914).

The spelling of 21434400502 in words is "twenty-one billion, four hundred thirty-four million, four hundred thousand, five hundred two".