21313698 has 32 divisors (see below), whose sum is σ = 48854016. Its totient is φ = 6072528.

The previous prime is 21313697. The next prime is 21313729. The reversal of 21313698 is 89631312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21313693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28315 + ... + 29057.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^21313698 is an apocalyptic number.

21313698 is an abundant number, since it is smaller than the sum of its proper divisors (27540318).

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

21313698 is a wasteful number, since it uses less digits than its factorization.

21313698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438.

The product of its digits is 7776, while the sum is 33.

The square root of 21313698 is about 4616.6760770061. The cubic root of 21313698 is about 277.2593937478.

The spelling of 21313698 in words is "twenty-one million, three hundred thirteen thousand, six hundred ninety-eight".