21377169 has 32 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 12848400.

The previous prime is 21377159. The next prime is 21377171. The reversal of 21377169 is 96177312.

It is a happy number.

It is not a de Polignac number, because 21377169 - 2²¹ = 19280017 is a prime.

It is a super-2 number, since 2×21377169² = 913966708909122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21377119) 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, 49384 + ... + 49814.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^21377169 is an apocalyptic number.

It is an amenable number.

21377169 is a deficient number, since it is larger than the sum of its proper divisors (13459311).

21377169 is a wasteful number, since it uses less digits than its factorization.

21377169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 612 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 21377169 is about 4623.5450684513. The cubic root of 21377169 is about 277.5343419880.

The spelling of 21377169 in words is "twenty-one million, three hundred seventy-seven thousand, one hundred sixty-nine".