21450107 has 32 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 15994368.

The previous prime is 21450103. The next prime is 21450113. The reversal of 21450107 is 70105412.

It is a cyclic number.

It is not a de Polignac number, because 21450107 - 2² = 21450103 is a prime.

It is a super-2 number, since 2×21450107² = 920214180622898, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21450103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119744 + ... + 119922.

It is an arithmetic number, because the mean of its divisors is an integer number (874800).

Almost surely, 2^21450107 is an apocalyptic number.

21450107 is a deficient number, since it is larger than the sum of its proper divisors (6543493).

21450107 is a wasteful number, since it uses less digits than its factorization.

21450107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21450107 is about 4631.4260222959. The cubic root of 21450107 is about 277.8496288383.

Adding to 21450107 its reverse (70105412), we get a palindrome (91555519).

The spelling of 21450107 in words is "twenty-one million, four hundred fifty thousand, one hundred seven".