21390187577027 has 24 divisors (see below), whose sum is σ = 21821340320256. Its totient is φ = 20967352561584.

The previous prime is 21390187577023. The next prime is 21390187577119. The reversal of 21390187577027 is 72077578109312.

It is not a de Polignac number, because 21390187577027 - 2² = 21390187577023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21390187577023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2412332048 + ... + 2412340914.

It is an arithmetic number, because the mean of its divisors is an integer number (909222513344).

Almost surely, 2^{21390187577027} is an apocalyptic number.

21390187577027 is a deficient number, since it is larger than the sum of its proper divisors (431152743229).

21390187577027 is an equidigital number, since it uses as much as digits as its factorization.

21390187577027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10895 (or 10836 counting only the distinct ones).

The product of its (nonzero) digits is 10372320, while the sum is 59.

The spelling of 21390187577027 in words is "twenty-one trillion, three hundred ninety billion, one hundred eighty-seven million, five hundred seventy-seven thousand, twenty-seven".