21120098 has 4 divisors (see below), whose sum is σ = 31680150. Its totient is φ = 10560048.

The previous prime is 21120089. The next prime is 21120109. The reversal of 21120098 is 89002112.

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., 20675209 + 444889 = 4547^2 + 667^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280023 + ... + 5280026.

Almost surely, 2^21120098 is an apocalyptic number.

21120098 is a deficient number, since it is larger than the sum of its proper divisors (10560052).

21120098 is a wasteful number, since it uses less digits than its factorization.

21120098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560051.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 21120098 is about 4595.6607794745. The cubic root of 21120098 is about 276.4173567386.

The spelling of 21120098 in words is "twenty-one million, one hundred twenty thousand, ninety-eight".