21771101 has 8 divisors (see below), whose sum is σ = 25147584. Its totient is φ = 18627520.

The previous prime is 21771097. The next prime is 21771121. The reversal of 21771101 is 10117712.

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 21771101 - 2² = 21771097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21771121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58025 + ... + 58398.

It is an arithmetic number, because the mean of its divisors is an integer number (3143448).

Almost surely, 2^21771101 is an apocalyptic number.

It is an amenable number.

21771101 is a deficient number, since it is larger than the sum of its proper divisors (3376483).

21771101 is a wasteful number, since it uses less digits than its factorization.

21771101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116451.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 21771101 is about 4665.9512427800. The cubic root of 21771101 is about 279.2287491640.

Adding to 21771101 its reverse (10117712), we get a palindrome (31888813).

The spelling of 21771101 in words is "twenty-one million, seven hundred seventy-one thousand, one hundred one".