21361098 has 24 divisors (see below), whose sum is σ = 46960704. Its totient is φ = 6472840.

The previous prime is 21361097. The next prime is 21361121. The reversal of 21361098 is 89016312.

It is not an unprimeable number, because it can be changed into a prime (21361091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13986 + ... + 15437.

It is an arithmetic number, because the mean of its divisors is an integer number (1956696).

Almost surely, 2^21361098 is an apocalyptic number.

21361098 is an abundant number, since it is smaller than the sum of its proper divisors (25599606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361098 is a wasteful number, since it uses less digits than its factorization.

21361098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29450 (or 29439 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21361098 is about 4621.8067895575. The cubic root of 21361098 is about 277.4647759852.

The spelling of 21361098 in words is "twenty-one million, three hundred sixty-one thousand, ninety-eight".