21769485 has 32 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 11251968.

The previous prime is 21769453. The next prime is 21769487. The reversal of 21769485 is 58496712.

It is not a de Polignac number, because 21769485 - 2⁵ = 21769453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21769487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110407 + ... + 110603.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^21769485 is an apocalyptic number.

It is an amenable number.

21769485 is a deficient number, since it is larger than the sum of its proper divisors (14155635).

21769485 is a wasteful number, since it uses less digits than its factorization.

21769485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397.

The product of its digits is 120960, while the sum is 42.

The square root of 21769485 is about 4665.7780701615. The cubic root of 21769485 is about 279.2218402373.

The spelling of 21769485 in words is "twenty-one million, seven hundred sixty-nine thousand, four hundred eighty-five".