21154703136 has 96 divisors (see below), whose sum is σ = 63681303168. Its totient is φ = 6023516160.

The previous prime is 21154703107. The next prime is 21154703191. The reversal of 21154703136 is 63130745112.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21154703097 and 21154703106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143176 + ... + 250616.

It is an arithmetic number, because the mean of its divisors is an integer number (663346908).

Almost surely, 2^21154703136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21154703136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31840651584).

21154703136 is an abundant number, since it is smaller than the sum of its proper divisors (42526600032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154703136 is a wasteful number, since it uses less digits than its factorization.

21154703136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107754 (or 107746 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 21154703136 in words is "twenty-one billion, one hundred fifty-four million, seven hundred three thousand, one hundred thirty-six".