21298054 has 8 divisors (see below), whose sum is σ = 32977728. Its totient is φ = 10305480.

The previous prime is 21298033. The next prime is 21298073. The reversal of 21298054 is 45089212.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent 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, 171697 + ... + 171820.

It is an arithmetic number, because the mean of its divisors is an integer number (4122216).

Almost surely, 2^21298054 is an apocalyptic number.

21298054 is a deficient number, since it is larger than the sum of its proper divisors (11679674).

21298054 is a wasteful number, since it uses less digits than its factorization.

21298054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343550.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21298054 is about 4614.9814734189. The cubic root of 21298054 is about 277.1915421154.

The spelling of 21298054 in words is "twenty-one million, two hundred ninety-eight thousand, fifty-four".