21673802 has 4 divisors (see below), whose sum is σ = 32510706. Its totient is φ = 10836900.

The previous prime is 21673787. The next prime is 21673807. The reversal of 21673802 is 20837612.

It is a happy number.

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., 14280841 + 7392961 = 3779^2 + 2719^2 .

It is not an unprimeable number, because it can be changed into a prime (21673807) 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 as a sum of consecutive naturals, namely, 5418449 + ... + 5418452.

Almost surely, 2^21673802 is an apocalyptic number.

21673802 is a deficient number, since it is larger than the sum of its proper divisors (10836904).

21673802 is a wasteful number, since it uses less digits than its factorization.

21673802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836903.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21673802 is about 4655.5130759133. The cubic root of 21673802 is about 278.8121532865.

The spelling of 21673802 in words is "twenty-one million, six hundred seventy-three thousand, eight hundred two".