21760755 has 16 divisors (see below), whose sum is σ = 34953120. Its totient is φ = 11560448.

The previous prime is 21760751. The next prime is 21760763. The reversal of 21760755 is 55706712.

It is a cyclic number.

It is not a de Polignac number, because 21760755 - 2² = 21760751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21760751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (2184570).

Almost surely, 2^21760755 is an apocalyptic number.

21760755 is a deficient number, since it is larger than the sum of its proper divisors (13192365).

21760755 is a wasteful number, since it uses less digits than its factorization.

21760755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 21760755 is about 4664.8424410692. The cubic root of 21760755 is about 279.1845107279.

The spelling of 21760755 in words is "twenty-one million, seven hundred sixty thousand, seven hundred fifty-five".