21363425306666 has 8 divisors (see below), whose sum is σ = 33731724168480. Its totient is φ = 10119517250508.

The previous prime is 21363425306653. The next prime is 21363425306687. The reversal of 21363425306666 is 66660352436312.

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

It is a super-4 number, since 4×21363425306666⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281097701366 + ... + 281097701441.

It is an arithmetic number, because the mean of its divisors is an integer number (4216465521060).

Almost surely, 2^{21363425306666} is an apocalyptic number.

21363425306666 is a deficient number, since it is larger than the sum of its proper divisors (12368298861814).

21363425306666 is a wasteful number, since it uses less digits than its factorization.

21363425306666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562195402828.

The product of its (nonzero) digits is 16796160, while the sum is 53.

The spelling of 21363425306666 in words is "twenty-one trillion, three hundred sixty-three billion, four hundred twenty-five million, three hundred six thousand, six hundred sixty-six".