21092798 has 4 divisors (see below), whose sum is σ = 31639200. Its totient is φ = 10546398.

The previous prime is 21092789. The next prime is 21092821. The reversal of 21092798 is 89729012.

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

It is a super-2 number, since 2×21092798² = 889812254937608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5273198 + ... + 5273201.

It is an arithmetic number, because the mean of its divisors is an integer number (7909800).

Almost surely, 2^21092798 is an apocalyptic number.

21092798 is a deficient number, since it is larger than the sum of its proper divisors (10546402).

21092798 is a wasteful number, since it uses less digits than its factorization.

21092798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10546401.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 21092798 is about 4592.6896259164. The cubic root of 21092798 is about 276.2982056564.

The spelling of 21092798 in words is "twenty-one million, ninety-two thousand, seven hundred ninety-eight".