21434123315 has 48 divisors (see below), whose sum is σ = 29549850624. Its totient is φ = 14886020160.

The previous prime is 21434123309. The next prime is 21434123357. The reversal of 21434123315 is 51332143412.

It is not a de Polignac number, because 21434123315 - 2¹⁴ = 21434106931 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13677662 + ... + 13679228.

It is an arithmetic number, because the mean of its divisors is an integer number (615621888).

Almost surely, 2^21434123315 is an apocalyptic number.

21434123315 is a deficient number, since it is larger than the sum of its proper divisors (8115727309).

21434123315 is a wasteful number, since it uses less digits than its factorization.

21434123315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600 (or 2589 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

Adding to 21434123315 its reverse (51332143412), we get a palindrome (72766266727).

The spelling of 21434123315 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty-three thousand, three hundred fifteen".