21258098 has 8 divisors (see below), whose sum is σ = 32078592. Its totient is φ = 10565236.

The previous prime is 21258059. The next prime is 21258101. The reversal of 21258098 is 89085212.

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

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31490 + ... + 32157.

It is an arithmetic number, because the mean of its divisors is an integer number (4009824).

Almost surely, 2^21258098 is an apocalyptic number.

21258098 is a deficient number, since it is larger than the sum of its proper divisors (10820494).

21258098 is a wasteful number, since it uses less digits than its factorization.

21258098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63816.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21258098 is about 4610.6504964050. The cubic root of 21258098 is about 277.0180928027.

The spelling of 21258098 in words is "twenty-one million, two hundred fifty-eight thousand, ninety-eight".