21655214504214 has 16 divisors (see below), whose sum is σ = 43310709055152. Its totient is φ = 7218358160288.

The previous prime is 21655214504201. The next prime is 21655214504267. The reversal of 21655214504214 is 41240541255612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10656609 + ... + 12524924.

It is an arithmetic number, because the mean of its divisors is an integer number (2706919315947).

Almost surely, 2^{21655214504214} is an apocalyptic number.

21655214504214 is an abundant number, since it is smaller than the sum of its proper divisors (21655494550938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21655214504214 is a wasteful number, since it uses less digits than its factorization.

21655214504214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23337231.

The product of its (nonzero) digits is 384000, while the sum is 42.

Adding to 21655214504214 its reverse (41240541255612), we get a palindrome (62895755759826).

The spelling of 21655214504214 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred fourteen million, five hundred four thousand, two hundred fourteen".