21214024240031 has 16 divisors (see below), whose sum is σ = 24941174870016. Its totient is φ = 17666665457856.

The previous prime is 21214024239973. The next prime is 21214024240049. The reversal of 21214024240031 is 13004242041212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214024240031 is a prime.

It is a super-2 number, since 2×21214024240031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214024240931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235284551 + ... + 235374696.

It is an arithmetic number, because the mean of its divisors is an integer number (1558823429376).

Almost surely, 2^{21214024240031} is an apocalyptic number.

21214024240031 is a deficient number, since it is larger than the sum of its proper divisors (3727150629985).

21214024240031 is a wasteful number, since it uses less digits than its factorization.

21214024240031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470659438.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21214024240031 its reverse (13004242041212), we get a palindrome (34218266281243).

The spelling of 21214024240031 in words is "twenty-one trillion, two hundred fourteen billion, twenty-four million, two hundred forty thousand, thirty-one".