21214026555431 has 8 divisors (see below), whose sum is σ = 21233322319344. Its totient is φ = 21194731514880.

The previous prime is 21214026555409. The next prime is 21214026555437. The reversal of 21214026555431 is 13455562041212.

It is a happy number.

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 21214026555431 - 2¹⁴ = 21214026539047 is a prime.

It is a super-2 number, since 2×21214026555431² (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 (21214026555437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71293421 + ... + 71590361.

It is an arithmetic number, because the mean of its divisors is an integer number (2654165289918).

Almost surely, 2^{21214026555431} is an apocalyptic number.

21214026555431 is a deficient number, since it is larger than the sum of its proper divisors (19295763913).

21214026555431 is a wasteful number, since it uses less digits than its factorization.

21214026555431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361681.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 21214026555431 its reverse (13455562041212), we get a palindrome (34669588596643).

The spelling of 21214026555431 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, five hundred fifty-five thousand, four hundred thirty-one".