21477564761723 has 8 divisors (see below), whose sum is σ = 25337587921920. Its totient is φ = 17815491507240.

The previous prime is 21477564761711. The next prime is 21477564761747. The reversal of 21477564761723 is 32716746577412.

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

It is not a de Polignac number, because 21477564761723 - 2¹⁰ = 21477564760699 is a prime.

It is a super-2 number, since 2×21477564761723² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21477564751723) 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, 49487476193 + ... + 49487476626.

It is an arithmetic number, because the mean of its divisors is an integer number (3167198490240).

Almost surely, 2^{21477564761723} is an apocalyptic number.

21477564761723 is a deficient number, since it is larger than the sum of its proper divisors (3860023160197).

21477564761723 is an equidigital number, since it uses as much as digits as its factorization.

21477564761723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98974952857.

The product of its digits is 82978560, while the sum is 62.

The spelling of 21477564761723 in words is "twenty-one trillion, four hundred seventy-seven billion, five hundred sixty-four million, seven hundred sixty-one thousand, seven hundred twenty-three".