21434320131 has 8 divisors (see below), whose sum is σ = 32661821184. Its totient is φ = 12248182920.

The previous prime is 21434320129. The next prime is 21434320163. The reversal of 21434320131 is 13102343412.

It is a happy number.

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

It is not a de Polignac number, because 21434320131 - 2¹ = 21434320129 is a prime.

It is a super-2 number, since 2×21434320131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21434320231) 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, 510340935 + ... + 510340976.

It is an arithmetic number, because the mean of its divisors is an integer number (4082727648).

Almost surely, 2^21434320131 is an apocalyptic number.

21434320131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21434320131 is a deficient number, since it is larger than the sum of its proper divisors (11227501053).

21434320131 is a wasteful number, since it uses less digits than its factorization.

21434320131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020681921.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21434320131 its reverse (13102343412), we get a palindrome (34536663543).

The spelling of 21434320131 in words is "twenty-one billion, four hundred thirty-four million, three hundred twenty thousand, one hundred thirty-one".