21499122 has 8 divisors (see below), whose sum is σ = 42998256. Its totient is φ = 7166372.

The previous prime is 21499111. The next prime is 21499123. The reversal of 21499122 is 22199412.

It is a happy number.

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

21499122 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21499122.

It is not an unprimeable number, because it can be changed into a prime (21499123) 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, 1791588 + ... + 1791599.

It is an arithmetic number, because the mean of its divisors is an integer number (5374782).

Almost surely, 2^21499122 is an apocalyptic number.

21499122 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.

21499122 is a wasteful number, since it uses less digits than its factorization.

21499122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583192.

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

The square root of 21499122 is about 4636.7145696064. The cubic root of 21499122 is about 278.0611031432.

The spelling of 21499122 in words is "twenty-one million, four hundred ninety-nine thousand, one hundred twenty-two".