21453029280 has 96 divisors (see below), whose sum is σ = 75085617600. Its totient is φ = 5720806656.

The previous prime is 21453029203. The next prime is 21453029291. The reversal of 21453029280 is 8292035412.

It is a happy number.

21453029280 is a `hidden beast` number, since 21 + 4 + 530 + 29 + 2 + 80 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2478670 + ... + 2487309.

It is an arithmetic number, because the mean of its divisors is an integer number (782141850).

Almost surely, 2^21453029280 is an apocalyptic number.

21453029280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21453029280 is an abundant number, since it is smaller than the sum of its proper divisors (53632588320).

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

21453029280 is a wasteful number, since it uses less digits than its factorization.

21453029280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966003 (or 4965989 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21453029280 in words is "twenty-one billion, four hundred fifty-three million, twenty-nine thousand, two hundred eighty".