21144998 has 8 divisors (see below), whose sum is σ = 36248592. Its totient is φ = 9062136.

The previous prime is 21144989. The next prime is 21145001. The reversal of 21144998 is 89944112.

21144998 is nontrivially palindromic in base 6.

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

It is a super-2 number, since 2×21144998² = 894221880840008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755165 + ... + 755192.

It is an arithmetic number, because the mean of its divisors is an integer number (4531074).

Almost surely, 2^21144998 is an apocalyptic number.

21144998 is a deficient number, since it is larger than the sum of its proper divisors (15103594).

21144998 is a wasteful number, since it uses less digits than its factorization.

21144998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510366.

The product of its digits is 20736, while the sum is 38.

The square root of 21144998 is about 4598.3690586990. The cubic root of 21144998 is about 276.5259434993.

The spelling of 21144998 in words is "twenty-one million, one hundred forty-four thousand, nine hundred ninety-eight".