27784013121 has 32 divisors (see below), whose sum is σ = 44233303680. Its totient is φ = 17172891648.

The previous prime is 27784013119. The next prime is 27784013123. The reversal of 27784013121 is 12131048772.

It is an interprime number because it is at equal distance from previous prime (27784013119) and next prime (27784013123).

It is not a de Polignac number, because 27784013121 - 2¹ = 27784013119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27784013123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420976 + ... + 482481.

It is an arithmetic number, because the mean of its divisors is an integer number (1382290740).

Almost surely, 2^27784013121 is an apocalyptic number.

It is an amenable number.

27784013121 is a deficient number, since it is larger than the sum of its proper divisors (16449290559).

27784013121 is a wasteful number, since it uses less digits than its factorization.

27784013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903550 (or 903544 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 27784013121 in words is "twenty-seven billion, seven hundred eighty-four million, thirteen thousand, one hundred twenty-one".