21769298 has 4 divisors (see below), whose sum is σ = 32653950. Its totient is φ = 10884648.

The previous prime is 21769291. The next prime is 21769301. The reversal of 21769298 is 89296712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14190289 + 7579009 = 3767^2 + 2753^2 .

It is not an unprimeable number, because it can be changed into a prime (21769291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5442323 + ... + 5442326.

Almost surely, 2^21769298 is an apocalyptic number.

21769298 is a deficient number, since it is larger than the sum of its proper divisors (10884652).

21769298 is a wasteful number, since it uses less digits than its factorization.

21769298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10884651.

The product of its digits is 108864, while the sum is 44.

The square root of 21769298 is about 4665.7580305884. The cubic root of 21769298 is about 279.2210407292.

The spelling of 21769298 in words is "twenty-one million, seven hundred sixty-nine thousand, two hundred ninety-eight".