21545366479 has 8 divisors (see below), whose sum is σ = 26517374240. Its totient is φ = 17046883296.

The previous prime is 21545366467. The next prime is 21545366509. The reversal of 21545366479 is 97466354512.

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

It is a cyclic number.

It is not a de Polignac number, because 21545366479 - 2¹³ = 21545358287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545366779) 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, 118381044 + ... + 118381225.

It is an arithmetic number, because the mean of its divisors is an integer number (3314671780).

Almost surely, 2^21545366479 is an apocalyptic number.

21545366479 is a deficient number, since it is larger than the sum of its proper divisors (4972007761).

21545366479 is a wasteful number, since it uses less digits than its factorization.

21545366479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236762289.

The product of its digits is 5443200, while the sum is 52.

The spelling of 21545366479 in words is "twenty-one billion, five hundred forty-five million, three hundred sixty-six thousand, four hundred seventy-nine".