21280132758 has 16 divisors (see below), whose sum is σ = 42579524016. Its totient is φ = 7090167840.

The previous prime is 21280132697. The next prime is 21280132759. The reversal of 21280132758 is 85723108212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21280132759) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 788053 + ... + 814608.

It is an arithmetic number, because the mean of its divisors is an integer number (2661220251).

Almost surely, 2^21280132758 is an apocalyptic number.

21280132758 is an abundant number, since it is smaller than the sum of its proper divisors (21299391258).

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

21280132758 is a wasteful number, since it uses less digits than its factorization.

21280132758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604879.

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 21280132758 in words is "twenty-one billion, two hundred eighty million, one hundred thirty-two thousand, seven hundred fifty-eight".