21298707 has 12 divisors (see below), whose sum is σ = 31904600. Its totient is φ = 14198976.

The previous prime is 21298691. The next prime is 21298723. The reversal of 21298707 is 70789212.

It is an interprime number because it is at equal distance from previous prime (21298691) and next prime (21298723).

It is not a de Polignac number, because 21298707 - 2⁴ = 21298691 is a prime.

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 (21298747) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 43582 + ... + 44067.

Almost surely, 2^21298707 is an apocalyptic number.

21298707 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21298707 is a deficient number, since it is larger than the sum of its proper divisors (10605893).

21298707 is an frugal number, since it uses more digits than its factorization.

21298707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87664 (or 87652 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 21298707 is about 4615.0522207230. The cubic root of 21298707 is about 277.1943749913.

The spelling of 21298707 in words is "twenty-one million, two hundred ninety-eight thousand, seven hundred seven".