21440476741666 has 32 divisors (see below), whose sum is σ = 33572000689920. Its totient is φ = 10250171802816.

The previous prime is 21440476741639. The next prime is 21440476741667. The reversal of 21440476741666 is 66614767404412.

It is a super-2 number, since 2×21440476741666² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21440476741666.

It is not an unprimeable number, because it can be changed into a prime (21440476741667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2641424640 + ... + 2641432756.

It is an arithmetic number, because the mean of its divisors is an integer number (1049125021560).

Almost surely, 2^{21440476741666} is an apocalyptic number.

21440476741666 is a deficient number, since it is larger than the sum of its proper divisors (12131523948254).

21440476741666 is a wasteful number, since it uses less digits than its factorization.

21440476741666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23298.

The product of its (nonzero) digits is 32514048, while the sum is 58.

The spelling of 21440476741666 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred sixty-six".