21027389495 has 16 divisors (see below), whose sum is σ = 28874905920. Its totient is φ = 14400109824.

The previous prime is 21027389491. The next prime is 21027389507. The reversal of 21027389495 is 59498372012.

It is a cyclic number.

It is not a de Polignac number, because 21027389495 - 2² = 21027389491 is a prime.

It is a super-2 number, since 2×21027389495² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027389491) 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, 361550 + ... + 415659.

It is an arithmetic number, because the mean of its divisors is an integer number (1804681620).

Almost surely, 2^21027389495 is an apocalyptic number.

21027389495 is a deficient number, since it is larger than the sum of its proper divisors (7847516425).

21027389495 is an equidigital number, since it uses as much as digits as its factorization.

21027389495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777994.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 21027389495 in words is "twenty-one billion, twenty-seven million, three hundred eighty-nine thousand, four hundred ninety-five".