21790098 has 24 divisors (see below), whose sum is σ = 51504336. Its totient is φ = 6603000.

The previous prime is 21790091. The next prime is 21790099. The reversal of 21790098 is 89009712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21790091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54828 + ... + 55223.

It is an arithmetic number, because the mean of its divisors is an integer number (2146014).

Almost surely, 2^21790098 is an apocalyptic number.

21790098 is an abundant number, since it is smaller than the sum of its proper divisors (29714238).

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

21790098 is a wasteful number, since it uses less digits than its factorization.

21790098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110070 (or 110067 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 21790098 is about 4667.9865038365. The cubic root of 21790098 is about 279.3099419101.

The spelling of 21790098 in words is "twenty-one million, seven hundred ninety thousand, ninety-eight".