21154453154 has 16 divisors (see below), whose sum is σ = 32257072320. Its totient is φ = 10402151760.

The previous prime is 21154453139. The next prime is 21154453157. The reversal of 21154453154 is 45135445112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21154453157) by changing a digit.

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, 1123187 + ... + 1141865.

It is an arithmetic number, because the mean of its divisors is an integer number (2016067020).

Almost surely, 2^21154453154 is an apocalyptic number.

21154453154 is a deficient number, since it is larger than the sum of its proper divisors (11102619166).

21154453154 is a wasteful number, since it uses less digits than its factorization.

21154453154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28025.

The product of its digits is 48000, while the sum is 35.

Adding to 21154453154 its reverse (45135445112), we get a palindrome (66289898266).

The spelling of 21154453154 in words is "twenty-one billion, one hundred fifty-four million, four hundred fifty-three thousand, one hundred fifty-four".