21110757 has 16 divisors (see below), whose sum is σ = 30168960. Its totient is φ = 13096512.

The previous prime is 21110737. The next prime is 21110813. The reversal of 21110757 is 75701112.

It is a happy number.

It is not a de Polignac number, because 21110757 - 2¹² = 21106661 is a prime.

It is a super-2 number, since 2×21110757² = 891328122226098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110707) 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 15 ways as a sum of consecutive naturals, for example, 1582 + ... + 6687.

It is an arithmetic number, because the mean of its divisors is an integer number (1885560).

Almost surely, 2^21110757 is an apocalyptic number.

It is an amenable number.

21110757 is a deficient number, since it is larger than the sum of its proper divisors (9058203).

21110757 is a wasteful number, since it uses less digits than its factorization.

21110757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 21110757 is about 4594.6443823217. The cubic root of 21110757 is about 276.3765994264.

Adding to 21110757 its reverse (75701112), we get a palindrome (96811869).

The spelling of 21110757 in words is "twenty-one million, one hundred ten thousand, seven hundred fifty-seven".