21343976 has 16 divisors (see below), whose sum is σ = 42374340. Its totient is φ = 10044160.

The previous prime is 21343957. The next prime is 21343979. The reversal of 21343976 is 67934312.

It can be written as a sum of positive squares in 2 ways, for example, as 20921476 + 422500 = 4574^2 + 650^2 .

It is a super-2 number, since 2×21343976² = 911130622977152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21343979) 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 3 ways as a sum of consecutive naturals, for example, 78335 + ... + 78606.

Almost surely, 2^21343976 is an apocalyptic number.

It is an amenable number.

21343976 is a deficient number, since it is larger than the sum of its proper divisors (21030364).

21343976 is a wasteful number, since it uses less digits than its factorization.

21343976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156964 (or 156960 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 21343976 is about 4619.9541123262. The cubic root of 21343976 is about 277.3906221538.

The spelling of 21343976 in words is "twenty-one million, three hundred forty-three thousand, nine hundred seventy-six".