21307476553 has 8 divisors (see below), whose sum is σ = 23278561056. Its totient is φ = 19342065600.

The previous prime is 21307476539. The next prime is 21307476557. The reversal of 21307476553 is 35567470312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21307476553 - 2¹⁷ = 21307345481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21307476557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1410528 + ... + 1425553.

It is an arithmetic number, because the mean of its divisors is an integer number (2909820132).

Almost surely, 2^21307476553 is an apocalyptic number.

It is an amenable number.

21307476553 is a deficient number, since it is larger than the sum of its proper divisors (1971084503).

21307476553 is a wasteful number, since it uses less digits than its factorization.

21307476553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836775.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 21307476553 in words is "twenty-one billion, three hundred seven million, four hundred seventy-six thousand, five hundred fifty-three".