21511513154 has 8 divisors (see below), whose sum is σ = 32268557628. Its totient is φ = 10755327280.

The previous prime is 21511513151. The next prime is 21511513181. The reversal of 21511513154 is 45131511512.

It is a happy number.

21511513154 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20728800625 + 782712529 = 143975^2 + 27977^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21511513151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147857 + ... + 254724.

Almost surely, 2^21511513154 is an apocalyptic number.

21511513154 is a deficient number, since it is larger than the sum of its proper divisors (10757044474).

21511513154 is a wasteful number, since it uses less digits than its factorization.

21511513154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429300.

The product of its digits is 3000, while the sum is 29.

The spelling of 21511513154 in words is "twenty-one billion, five hundred eleven million, five hundred thirteen thousand, one hundred fifty-four".