21756701 has 8 divisors (see below), whose sum is σ = 22136064. Its totient is φ = 21379680.

The previous prime is 21756677. The next prime is 21756733. The reversal of 21756701 is 10765712.

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

It is a cyclic number.

It is not a de Polignac number, because 21756701 - 2¹⁴ = 21740317 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 (21756101) 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, 35540 + ... + 36146.

It is an arithmetic number, because the mean of its divisors is an integer number (2767008).

Almost surely, 2^21756701 is an apocalyptic number.

It is an amenable number.

21756701 is a deficient number, since it is larger than the sum of its proper divisors (379363).

21756701 is an equidigital number, since it uses as much as digits as its factorization.

21756701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 21756701 is about 4664.4078938275. The cubic root of 21756701 is about 279.1671724156.

The spelling of 21756701 in words is "twenty-one million, seven hundred fifty-six thousand, seven hundred one".