21379802 has 8 divisors (see below), whose sum is σ = 32509236. Its totient is φ = 10543392.

The previous prime is 21379763. The next prime is 21379817. The reversal of 21379802 is 20897312.

It can be written as a sum of positive squares in 2 ways, for example, as 20421361 + 958441 = 4519^2 + 979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 73073 + ... + 73364.

Almost surely, 2^21379802 is an apocalyptic number.

21379802 is a deficient number, since it is larger than the sum of its proper divisors (11129434).

21379802 is a wasteful number, since it uses less digits than its factorization.

21379802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146512.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21379802 is about 4623.8297979056. The cubic root of 21379802 is about 277.5457360430.

The spelling of 21379802 in words is "twenty-one million, three hundred seventy-nine thousand, eight hundred two".