21208047726624 has 96 divisors (see below), whose sum is σ = 60877083375360. Its totient is φ = 6411342854400.

The previous prime is 21208047726599. The next prime is 21208047726629. The reversal of 21208047726624 is 42662774080212.

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

It is a super-2 number, since 2×21208047726624² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21208047726629) 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 15 ways as a sum of consecutive naturals, for example, 23523382 + ... + 24408309.

It is an arithmetic number, because the mean of its divisors is an integer number (634136285160).

Almost surely, 2^{21208047726624} is an apocalyptic number.

21208047726624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21208047726624 is an abundant number, since it is smaller than the sum of its proper divisors (39669035648736).

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

21208047726624 is a wasteful number, since it uses less digits than its factorization.

21208047726624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47932134 (or 47932126 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 51.

The spelling of 21208047726624 in words is "twenty-one trillion, two hundred eight billion, forty-seven million, seven hundred twenty-six thousand, six hundred twenty-four".