21214232131505 has 16 divisors (see below), whose sum is σ = 29198835863040. Its totient is φ = 14494386134592.

The previous prime is 21214232131451. The next prime is 21214232131511. The reversal of 21214232131505 is 50513123241212.

It is not a de Polignac number, because 21214232131505 - 2⁶ = 21214232131441 is a prime.

It is a super-2 number, since 2×21214232131505² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1094071385 + ... + 1094090774.

It is an arithmetic number, because the mean of its divisors is an integer number (1824927241440).

Almost surely, 2^{21214232131505} is an apocalyptic number.

It is an amenable number.

21214232131505 is a deficient number, since it is larger than the sum of its proper divisors (7984603731535).

21214232131505 is a wasteful number, since it uses less digits than its factorization.

21214232131505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188162448.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21214232131505 its reverse (50513123241212), we get a palindrome (71727355372717).

The spelling of 21214232131505 in words is "twenty-one trillion, two hundred fourteen billion, two hundred thirty-two million, one hundred thirty-one thousand, five hundred five".