21674763 has 64 divisors (see below), whose sum is σ = 38707200. Its totient is φ = 11832480.

The previous prime is 21674761. The next prime is 21674789. The reversal of 21674763 is 36747612.

It is not a de Polignac number, because 21674763 - 2¹ = 21674761 is a prime.

It is a super-2 number, since 2×21674763² = 939590702212338, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21674761) 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 63 ways as a sum of consecutive naturals, for example, 129706 + ... + 129872.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^21674763 is an apocalyptic number.

21674763 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21674763 is a deficient number, since it is larger than the sum of its proper divisors (17032437).

21674763 is a wasteful number, since it uses less digits than its factorization.

21674763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 223 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21674763 is about 4655.6162857349. The cubic root of 21674763 is about 278.8162739990.

The spelling of 21674763 in words is "twenty-one million, six hundred seventy-four thousand, seven hundred sixty-three".