27930010821 has 16 divisors (see below), whose sum is σ = 40702560768. Its totient is φ = 16959398400.

The previous prime is 27930010819. The next prime is 27930010837. The reversal of 27930010821 is 12801003972.

It is not a de Polignac number, because 27930010821 - 2¹ = 27930010819 is a prime.

It is a super-2 number, since 2×27930010821² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27930010721) 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, 8831440 + ... + 8834601.

It is an arithmetic number, because the mean of its divisors is an integer number (2543910048).

Almost surely, 2^27930010821 is an apocalyptic number.

It is an amenable number.

27930010821 is a deficient number, since it is larger than the sum of its proper divisors (12772549947).

27930010821 is a wasteful number, since it uses less digits than its factorization.

27930010821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17666092.

The product of its (nonzero) digits is 6048, while the sum is 33.

The spelling of 27930010821 in words is "twenty-seven billion, nine hundred thirty million, ten thousand, eight hundred twenty-one".