21080541466 has 4 divisors (see below), whose sum is σ = 31620812202. Its totient is φ = 10540270732.

The previous prime is 21080541451. The next prime is 21080541479. The reversal of 21080541466 is 66414508012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20610909225 + 469632241 = 143565^2 + 21671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5270135365 + ... + 5270135368.

Almost surely, 2^21080541466 is an apocalyptic number.

21080541466 is a deficient number, since it is larger than the sum of its proper divisors (10540270736).

21080541466 is a wasteful number, since it uses less digits than its factorization.

21080541466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540270735.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21080541466 in words is "twenty-one billion, eighty million, five hundred forty-one thousand, four hundred sixty-six".