21070502 has 4 divisors (see below), whose sum is σ = 31605756. Its totient is φ = 10535250.

The previous prime is 21070481. The next prime is 21070513. The reversal of 21070502 is 20507012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5267624 + ... + 5267627.

It is an arithmetic number, because the mean of its divisors is an integer number (7901439).

Almost surely, 2^21070502 is an apocalyptic number.

21070502 is a deficient number, since it is larger than the sum of its proper divisors (10535254).

21070502 is a wasteful number, since it uses less digits than its factorization.

21070502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535253.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21070502 is about 4590.2616483159. The cubic root of 21070502 is about 276.2008182819.

Adding to 21070502 its reverse (20507012), we get a palindrome (41577514).

The spelling of 21070502 in words is "twenty-one million, seventy thousand, five hundred two".