21122515154 has 8 divisors (see below), whose sum is σ = 34120986060. Its totient is φ = 9748853136.

The previous prime is 21122515153. The next prime is 21122515163. The reversal of 21122515154 is 45151522112.

It can be written as a sum of positive squares in 2 ways, for example, as 20930276929 + 192238225 = 144673^2 + 13865^2 .

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 (21122515151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406202189 + ... + 406202240.

Almost surely, 2^21122515154 is an apocalyptic number.

21122515154 is a deficient number, since it is larger than the sum of its proper divisors (12998470906).

21122515154 is a wasteful number, since it uses less digits than its factorization.

21122515154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812404444.

The product of its digits is 4000, while the sum is 29.

The spelling of 21122515154 in words is "twenty-one billion, one hundred twenty-two million, five hundred fifteen thousand, one hundred fifty-four".