21413402 has 4 divisors (see below), whose sum is σ = 32120106. Its totient is φ = 10706700.

The previous prime is 21413393. The next prime is 21413423. The reversal of 21413402 is 20431412.

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., 18241441 + 3171961 = 4271^2 + 1781^2 .

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, 5353349 + ... + 5353352.

Almost surely, 2^21413402 is an apocalyptic number.

21413402 is a deficient number, since it is larger than the sum of its proper divisors (10706704).

21413402 is a wasteful number, since it uses less digits than its factorization.

21413402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706703.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21413402 is about 4627.4617232345. The cubic root of 21413402 is about 277.6910547528.

Adding to 21413402 its reverse (20431412), we get a palindrome (41844814).

The spelling of 21413402 in words is "twenty-one million, four hundred thirteen thousand, four hundred two".