21431113154 has 16 divisors (see below), whose sum is σ = 35663487840. Its totient is φ = 9576305760.

The previous prime is 21431113133. The next prime is 21431113177. The reversal of 21431113154 is 45131113412.

It is a super-2 number, since 2×21431113154² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8254139 + ... + 8256734.

It is an arithmetic number, because the mean of its divisors is an integer number (2228967990).

Almost surely, 2^21431113154 is an apocalyptic number.

21431113154 is a deficient number, since it is larger than the sum of its proper divisors (14232374686).

21431113154 is a wasteful number, since it uses less digits than its factorization.

21431113154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16510945.

The product of its digits is 1440, while the sum is 26.

Adding to 21431113154 its reverse (45131113412), we get a palindrome (66562226566).

The spelling of 21431113154 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirteen thousand, one hundred fifty-four".