21698084 has 12 divisors (see below), whose sum is σ = 38538864. Its totient is φ = 10686984.

The previous prime is 21698081. The next prime is 21698107. The reversal of 21698084 is 48089612.

It is not an unprimeable number, because it can be changed into a prime (21698081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40214 + ... + 40749.

It is an arithmetic number, because the mean of its divisors is an integer number (3211572).

Almost surely, 2^21698084 is an apocalyptic number.

It is an amenable number.

21698084 is a deficient number, since it is larger than the sum of its proper divisors (16840780).

21698084 is a wasteful number, since it uses less digits than its factorization.

21698084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81034 (or 81032 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21698084 is about 4658.1202217203. The cubic root of 21698084 is about 278.9162357790.

The spelling of 21698084 in words is "twenty-one million, six hundred ninety-eight thousand, eighty-four".