21354776075666 has 8 divisors (see below), whose sum is σ = 34944179032944. Its totient is φ = 9706716398020.

The previous prime is 21354776075663. The next prime is 21354776075837. The reversal of 21354776075666 is 66657067745312.

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

It is a super-2 number, since 2×21354776075666² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21354776075663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485335819880 + ... + 485335819923.

It is an arithmetic number, because the mean of its divisors is an integer number (4368022379118).

Almost surely, 2^{21354776075666} is an apocalyptic number.

21354776075666 is a deficient number, since it is larger than the sum of its proper divisors (13589402957278).

21354776075666 is a wasteful number, since it uses less digits than its factorization.

21354776075666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970671639816.

The product of its (nonzero) digits is 266716800, while the sum is 65.

The spelling of 21354776075666 in words is "twenty-one trillion, three hundred fifty-four billion, seven hundred seventy-six million, seventy-five thousand, six hundred sixty-six".