21376946 has 4 divisors (see below), whose sum is σ = 32065422. Its totient is φ = 10688472.

The previous prime is 21376937. The next prime is 21376951. The reversal of 21376946 is 64967312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 10080625 = 3361^2 + 3175^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5344235 + ... + 5344238.

Almost surely, 2^21376946 is an apocalyptic number.

21376946 is a deficient number, since it is larger than the sum of its proper divisors (10688476).

21376946 is a wasteful number, since it uses less digits than its factorization.

21376946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10688475.

The product of its digits is 54432, while the sum is 38.

The square root of 21376946 is about 4623.5209526940. The cubic root of 21376946 is about 277.5333769339.

It can be divided in two parts, 21376 and 946, that added together give a palindrome (22322).

The spelling of 21376946 in words is "twenty-one million, three hundred seventy-six thousand, nine hundred forty-six".