21154709448 has 96 divisors (see below), whose sum is σ = 61401038400. Its totient is φ = 6562664064.

The previous prime is 21154709437. The next prime is 21154709449. The reversal of 21154709448 is 84490745112.

21154709448 is a `hidden beast` number, since 2 + 11 + 547 + 0 + 94 + 4 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21154709449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111358 + ... + 233901.

It is an arithmetic number, because the mean of its divisors is an integer number (639594150).

Almost surely, 2^21154709448 is an apocalyptic number.

It is an amenable number.

21154709448 is an abundant number, since it is smaller than the sum of its proper divisors (40246328952).

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

21154709448 is a wasteful number, since it uses less digits than its factorization.

21154709448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345331 (or 345324 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21154709448 in words is "twenty-one billion, one hundred fifty-four million, seven hundred nine thousand, four hundred forty-eight".