21214040502506 has 8 divisors (see below), whose sum is σ = 31878190128420. Its totient is φ = 10587977126368.

The previous prime is 21214040502491. The next prime is 21214040502509. The reversal of 21214040502506 is 60520504041212.

It can be written as a sum of positive squares in 2 ways, for example, as 14263651725625 + 6950388776881 = 3776725^2 + 2636359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21214040502509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9521561051 + ... + 9521563278.

Almost surely, 2^{21214040502506} is an apocalyptic number.

21214040502506 is a deficient number, since it is larger than the sum of its proper divisors (10664149625914).

21214040502506 is a wasteful number, since it uses less digits than its factorization.

21214040502506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19043124888.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21214040502506 its reverse (60520504041212), we get a palindrome (81734544543718).

The spelling of 21214040502506 in words is "twenty-one trillion, two hundred fourteen billion, forty million, five hundred two thousand, five hundred six".