21938898 has 8 divisors (see below), whose sum is σ = 43877808. Its totient is φ = 7312964.

The previous prime is 21938881. The next prime is 21938899. The reversal of 21938898 is 89883912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21938898 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21938899) 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, 1828236 + ... + 1828247.

It is an arithmetic number, because the mean of its divisors is an integer number (5484726).

Almost surely, 2^21938898 is an apocalyptic number.

21938898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21938898 is a wasteful number, since it uses less digits than its factorization.

21938898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656488.

The product of its digits is 248832, while the sum is 48.

The square root of 21938898 is about 4683.8977358606. The cubic root of 21938898 is about 279.9442831314.

The spelling of 21938898 in words is "twenty-one million, nine hundred thirty-eight thousand, eight hundred ninety-eight".