21407002 has 8 divisors (see below), whose sum is σ = 32893812. Its totient is φ = 10442400.

The previous prime is 21406999. The next prime is 21407011. The reversal of 21407002 is 20070412.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 53361 = 4621^2 + 231^2 .

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130449 + ... + 130612.

Almost surely, 2^21407002 is an apocalyptic number.

21407002 is a deficient number, since it is larger than the sum of its proper divisors (11486810).

21407002 is a wasteful number, since it uses less digits than its factorization.

21407002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261104.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21407002 is about 4626.7701477381. The cubic root of 21407002 is about 277.6633867245.

Adding to 21407002 its reverse (20070412), we get a palindrome (41477414).

The spelling of 21407002 in words is "twenty-one million, four hundred seven thousand, two".