21798362 has 4 divisors (see below), whose sum is σ = 32697546. Its totient is φ = 10899180.

The previous prime is 21798341. The next prime is 21798367. The reversal of 21798362 is 26389712.

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., 21724921 + 73441 = 4661^2 + 271^2 .

It is not an unprimeable number, because it can be changed into a prime (21798367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5449589 + ... + 5449592.

Almost surely, 2^21798362 is an apocalyptic number.

21798362 is a deficient number, since it is larger than the sum of its proper divisors (10899184).

21798362 is a wasteful number, since it uses less digits than its factorization.

21798362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10899183.

The product of its digits is 36288, while the sum is 38.

The square root of 21798362 is about 4668.8715981487. The cubic root of 21798362 is about 279.3452473291.

The spelling of 21798362 in words is "twenty-one million, seven hundred ninety-eight thousand, three hundred sixty-two".