21111298 has 16 divisors (see below), whose sum is σ = 34614720. Its totient is φ = 9597456.

The previous prime is 21111287. The next prime is 21111301. The reversal of 21111298 is 89211112.

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, 4318 + ... + 7801.

It is an arithmetic number, because the mean of its divisors is an integer number (2163420).

Almost surely, 2^21111298 is an apocalyptic number.

21111298 is a deficient number, since it is larger than the sum of its proper divisors (13503422).

21111298 is a wasteful number, since it uses less digits than its factorization.

21111298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12201.

The product of its digits is 288, while the sum is 25.

The square root of 21111298 is about 4594.7032548359. The cubic root of 21111298 is about 276.3789602839.

The spelling of 21111298 in words is "twenty-one million, one hundred eleven thousand, two hundred ninety-eight".