21013802 has 8 divisors (see below), whose sum is σ = 33374916. Its totient is φ = 9888832.

The previous prime is 21013787. The next prime is 21013823. The reversal of 21013802 is 20831012.

It can be written as a sum of positive squares in 2 ways, for example, as 17884441 + 3129361 = 4229^2 + 1769^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308993 + ... + 309060.

Almost surely, 2^21013802 is an apocalyptic number.

21013802 is a deficient number, since it is larger than the sum of its proper divisors (12361114).

21013802 is a wasteful number, since it uses less digits than its factorization.

21013802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618072.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21013802 is about 4584.0813692604. The cubic root of 21013802 is about 275.9528467370.

Adding to 21013802 its reverse (20831012), we get a palindrome (41844814).

The spelling of 21013802 in words is "twenty-one million, thirteen thousand, eight hundred two".