21424346155 has 16 divisors (see below), whose sum is σ = 25821517824. Its totient is φ = 17064764640.

The previous prime is 21424346143. The next prime is 21424346161. The reversal of 21424346155 is 55164342412.

It is not a de Polignac number, because 21424346155 - 2⁹ = 21424345643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1148634 + ... + 1167136.

It is an arithmetic number, because the mean of its divisors is an integer number (1613844864).

Almost surely, 2^21424346155 is an apocalyptic number.

21424346155 is a deficient number, since it is larger than the sum of its proper divisors (4397171669).

21424346155 is a wasteful number, since it uses less digits than its factorization.

21424346155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19506.

The product of its digits is 115200, while the sum is 37.

Adding to 21424346155 its reverse (55164342412), we get a palindrome (76588688567).

The spelling of 21424346155 in words is "twenty-one billion, four hundred twenty-four million, three hundred forty-six thousand, one hundred fifty-five".