21901701 has 8 divisors (see below), whose sum is σ = 29227840. Its totient is φ = 14588352.

The previous prime is 21901639. The next prime is 21901703. The reversal of 21901701 is 10710912.

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

It is not a de Polignac number, because 21901701 - 2⁶ = 21901637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2016 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (3653480).

Almost surely, 2^21901701 is an apocalyptic number.

It is an amenable number.

21901701 is a deficient number, since it is larger than the sum of its proper divisors (7326139).

21901701 is a wasteful number, since it uses less digits than its factorization.

21901701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6395.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 21901701 is about 4679.9253199170. The cubic root of 21901701 is about 279.7859801617.

The spelling of 21901701 in words is "twenty-one million, nine hundred one thousand, seven hundred one".