27027000021 has 24 divisors (see below), whose sum is σ = 42493684224. Its totient is φ = 15232432320.

The previous prime is 27026999963. The next prime is 27027000023. The reversal of 27027000021 is 12000072072.

It is not a de Polignac number, because 27027000021 - 2⁷ = 27026999893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27027000023) 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, 1248565 + ... + 1270026.

It is an arithmetic number, because the mean of its divisors is an integer number (1770570176).

Almost surely, 2^27027000021 is an apocalyptic number.

27027000021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27027000021 is a deficient number, since it is larger than the sum of its proper divisors (15466684203).

27027000021 is a wasteful number, since it uses less digits than its factorization.

27027000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518681 (or 2518674 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

Adding to 27027000021 its reverse (12000072072), we get a palindrome (39027072093).

The spelling of 27027000021 in words is "twenty-seven billion, twenty-seven million, twenty-one", and thus it is an aban number and an uban number.