21300554 has 16 divisors (see below), whose sum is σ = 34926336. Its totient is φ = 9662400.

The previous prime is 21300551. The next prime is 21300557. The reversal of 21300554 is 45500312.

It is an interprime number because it is at equal distance from previous prime (21300551) and next prime (21300557).

It is not an unprimeable number, because it can be changed into a prime (21300551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20999 + ... + 21989.

It is an arithmetic number, because the mean of its divisors is an integer number (2182896).

Almost surely, 2^21300554 is an apocalyptic number.

21300554 is a deficient number, since it is larger than the sum of its proper divisors (13625782).

21300554 is a wasteful number, since it uses less digits than its factorization.

21300554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21300554 is about 4615.2523224630. The cubic root of 21300554 is about 277.2023874215.

Adding to 21300554 its reverse (45500312), we get a palindrome (66800866).

The spelling of 21300554 in words is "twenty-one million, three hundred thousand, five hundred fifty-four".