21286701 has 12 divisors (see below), whose sum is σ = 31047328. Its totient is φ = 14052744.

The previous prime is 21286693. The next prime is 21286709. The reversal of 21286701 is 10768212.

It is an interprime number because it is at equal distance from previous prime (21286693) and next prime (21286709).

It is not a de Polignac number, because 21286701 - 2³ = 21286693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21286709) 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, 10555 + ... + 12408.

Almost surely, 2^21286701 is an apocalyptic number.

It is an amenable number.

21286701 is a deficient number, since it is larger than the sum of its proper divisors (9760627).

21286701 is a wasteful number, since it uses less digits than its factorization.

21286701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23072 (or 23069 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 21286701 is about 4613.7512936872. The cubic root of 21286701 is about 277.1422807305.

The spelling of 21286701 in words is "twenty-one million, two hundred eighty-six thousand, seven hundred one".