21398002 has 16 divisors (see below), whose sum is σ = 34564320. Its totient is φ = 9898048.

The previous prime is 21397997. The next prime is 21398017. The reversal of 21398002 is 20089312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3328 + ... + 7339.

It is an arithmetic number, because the mean of its divisors is an integer number (2160270).

Almost surely, 2^21398002 is an apocalyptic number.

21398002 is a deficient number, since it is larger than the sum of its proper divisors (13166318).

21398002 is a wasteful number, since it uses less digits than its factorization.

21398002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21398002 is about 4625.7974447656. The cubic root of 21398002 is about 277.6244692281.

The spelling of 21398002 in words is "twenty-one million, three hundred ninety-eight thousand, two".