21214244131 has 8 divisors (see below), whose sum is σ = 21456175104. Its totient is φ = 20973676680.

The previous prime is 21214244123. The next prime is 21214244153. The reversal of 21214244131 is 13144241212.

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

It is a cyclic number.

It is not a de Polignac number, because 21214244131 - 2³ = 21214244123 is a prime.

It is a super-2 number, since 2×21214244131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214244096 and 21214244105.

It is not an unprimeable number, because it can be changed into a prime (21214244731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309571 + ... + 371836.

It is an arithmetic number, because the mean of its divisors is an integer number (2682021888).

Almost surely, 2^21214244131 is an apocalyptic number.

21214244131 is a deficient number, since it is larger than the sum of its proper divisors (241930973).

21214244131 is a wasteful number, since it uses less digits than its factorization.

21214244131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681761.

The product of its digits is 1536, while the sum is 25.

Adding to 21214244131 its reverse (13144241212), we get a palindrome (34358485343).

The spelling of 21214244131 in words is "twenty-one billion, two hundred fourteen million, two hundred forty-four thousand, one hundred thirty-one".