21470898 has 16 divisors (see below), whose sum is σ = 45468000. Its totient is φ = 6735936.

The previous prime is 21470843. The next prime is 21470899. The reversal of 21470898 is 89807412.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21470899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105148 + ... + 105351.

It is an arithmetic number, because the mean of its divisors is an integer number (2841750).

Almost surely, 2^21470898 is an apocalyptic number.

21470898 is an abundant number, since it is smaller than the sum of its proper divisors (23997102).

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

21470898 is a wasteful number, since it uses less digits than its factorization.

21470898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210521.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 21470898 is about 4633.6700357276. The cubic root of 21470898 is about 277.9393705230.

The spelling of 21470898 in words is "twenty-one million, four hundred seventy thousand, eight hundred ninety-eight".