21701001 has 8 divisors (see below), whose sum is σ = 33068224. Its totient is φ = 12400560.

The previous prime is 21700999. The next prime is 21701003. The reversal of 21701001 is 10010712.

It is an interprime number because it is at equal distance from previous prime (21700999) and next prime (21701003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21701001 - 2¹ = 21700999 is a prime.

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, 516670 + ... + 516711.

It is an arithmetic number, because the mean of its divisors is an integer number (4133528).

Almost surely, 2^21701001 is an apocalyptic number.

21701001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21701001 is a deficient number, since it is larger than the sum of its proper divisors (11367223).

21701001 is a wasteful number, since it uses less digits than its factorization.

21701001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033391.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 21701001 is about 4658.4333203342. The cubic root of 21701001 is about 278.9287339978.

Adding to 21701001 its reverse (10010712), we get a palindrome (31711713).

The spelling of 21701001 in words is "twenty-one million, seven hundred one thousand, one".