21701007 has 8 divisors (see below), whose sum is σ = 32149680. Its totient is φ = 14467320.

The previous prime is 21701003. The next prime is 21701039. The reversal of 21701007 is 70010712.

It is not a de Polignac number, because 21701007 - 2² = 21701003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701003) 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, 401844 + ... + 401897.

It is an arithmetic number, because the mean of its divisors is an integer number (4018710).

Almost surely, 2^21701007 is an apocalyptic number.

21701007 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21701007 is a deficient number, since it is larger than the sum of its proper divisors (10448673).

21701007 is an equidigital number, since it uses as much as digits as its factorization.

21701007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803750 (or 803744 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 21701007 is about 4658.4339643275. The cubic root of 21701007 is about 278.9287597043.

Adding to 21701007 its reverse (70010712), we get a palindrome (91711719).

The spelling of 21701007 in words is "twenty-one million, seven hundred one thousand, seven".