21534329448 has 48 divisors (see below), whose sum is σ = 59898423780. Its totient is φ = 6984105984.

The previous prime is 21534329429. The next prime is 21534329461. The reversal of 21534329448 is 84492343512.

21534329448 is a `hidden beast` number, since 2 + 15 + 343 + 294 + 4 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21217418244 + 316911204 = 145662^2 + 17802^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4039065 + ... + 4044392.

Almost surely, 2^21534329448 is an apocalyptic number.

It is an amenable number.

21534329448 is an abundant number, since it is smaller than the sum of its proper divisors (38364094332).

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

21534329448 is a wasteful number, since it uses less digits than its factorization.

21534329448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8083506 (or 8083499 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 21534329448 in words is "twenty-one billion, five hundred thirty-four million, three hundred twenty-nine thousand, four hundred forty-eight".