21769258 has 16 divisors (see below), whose sum is σ = 37384704. Its totient is φ = 9313200.

The previous prime is 21769249. The next prime is 21769261. The reversal of 21769258 is 85296712.

It is a self number, because there is not a number n which added to its sum of digits gives 21769258.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10183 + ... + 12133.

It is an arithmetic number, because the mean of its divisors is an integer number (2336544).

Almost surely, 2^21769258 is an apocalyptic number.

21769258 is a deficient number, since it is larger than the sum of its proper divisors (15615446).

21769258 is a wasteful number, since it uses less digits than its factorization.

21769258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757.

The product of its digits is 60480, while the sum is 40.

The square root of 21769258 is about 4665.7537440375. The cubic root of 21769258 is about 279.2208697109.

The spelling of 21769258 in words is "twenty-one million, seven hundred sixty-nine thousand, two hundred fifty-eight".