21301677 has 16 divisors (see below), whose sum is σ = 32412480. Its totient is φ = 13816656.

The previous prime is 21301613. The next prime is 21301691. The reversal of 21301677 is 77610312.

It is not a de Polignac number, because 21301677 - 2⁶ = 21301613 is a prime.

It is a super-2 number, since 2×21301677² = 907522886024658, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21301677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9663 + ... + 11660.

It is an arithmetic number, because the mean of its divisors is an integer number (2025780).

Almost surely, 2^21301677 is an apocalyptic number.

21301677 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21301677 is a deficient number, since it is larger than the sum of its proper divisors (11110803).

21301677 is a wasteful number, since it uses less digits than its factorization.

21301677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21369 (or 21363 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 21301677 is about 4615.3739826801. The cubic root of 21301677 is about 277.2072588568.

Adding to 21301677 its reverse (77610312), we get a palindrome (98911989).

The spelling of 21301677 in words is "twenty-one million, three hundred one thousand, six hundred seventy-seven".