21893049369 has 81 divisors (see below), whose sum is σ = 34382488959. Its totient is φ = 13423203360.

The previous prime is 21893049341. The next prime is 21893049371. The reversal of 21893049369 is 96394039812.

The square root of 21893049369 is 147963.

It is a perfect power (a square), and thus also a powerful number.

21893049369 is a `hidden beast` number, since 2 + 1 + 8 + 93 + 0 + 493 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19590201225 + 2302848144 = 139965^2 + 47988^2 .

It is not a de Polignac number, because 21893049369 - 2⁵ = 21893049337 is a prime.

It is a super-2 number, since 2×21893049369² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21893049319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 509140662 + ... + 509140704.

Almost surely, 2^21893049369 is an apocalyptic number.

21893049369 is the 147963-rd square number.

21893049369 is the 73982-nd centered octagonal number.

It is an amenable number.

21893049369 is a deficient number, since it is larger than the sum of its proper divisors (12489439590).

21893049369 is an equidigital number, since it uses as much as digits as its factorization.

21893049369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 21893049369 in words is "twenty-one billion, eight hundred ninety-three million, forty-nine thousand, three hundred sixty-nine".