21070702 has 4 divisors (see below), whose sum is σ = 31606056. Its totient is φ = 10535350.

The previous prime is 21070657. The next prime is 21070703. The reversal of 21070702 is 20707012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21070702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070703) by changing a digit.

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 as a sum of consecutive naturals, namely, 5267674 + ... + 5267677.

It is an arithmetic number, because the mean of its divisors is an integer number (7901514).

Almost surely, 2^21070702 is an apocalyptic number.

21070702 is a deficient number, since it is larger than the sum of its proper divisors (10535354).

21070702 is a wasteful number, since it uses less digits than its factorization.

21070702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535353.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 21070702 is about 4590.2834335148. The cubic root of 21070702 is about 276.2016921733.

Adding to 21070702 its reverse (20707012), we get a palindrome (41777714).

The spelling of 21070702 in words is "twenty-one million, seventy thousand, seven hundred two".