21101769 has 32 divisors (see below), whose sum is σ = 34137600. Its totient is φ = 12804480.

The previous prime is 21101767. The next prime is 21101771. The reversal of 21101769 is 96710112.

It is an interprime number because it is at equal distance from previous prime (21101767) and next prime (21101771).

It is not a de Polignac number, because 21101769 - 2¹ = 21101767 is a prime.

It is a super-2 number, since 2×21101769² = 890569309858722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101767) 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 31 ways as a sum of consecutive naturals, for example, 27349 + ... + 28109.

It is an arithmetic number, because the mean of its divisors is an integer number (1066800).

Almost surely, 2^21101769 is an apocalyptic number.

It is an amenable number.

21101769 is a deficient number, since it is larger than the sum of its proper divisors (13035831).

21101769 is a wasteful number, since it uses less digits than its factorization.

21101769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21101769 is about 4593.6661829088. Note that the first 3 decimals coincide. The cubic root of 21101769 is about 276.3373709975.

The spelling of 21101769 in words is "twenty-one million, one hundred one thousand, seven hundred sixty-nine".