21070010 has 32 divisors (see below), whose sum is σ = 41528592. Its totient is φ = 7649280.

The previous prime is 21070009. The next prime is 21070013. The reversal of 21070010 is 1007012.

It can be written as a sum of positive squares in 8 ways, for example, as 1771561 + 19298449 = 1331^2 + 4393^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21069973 and 21070000.

It is not an unprimeable number, because it can be changed into a prime (21070013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6602 + ... + 9258.

Almost surely, 2^21070010 is an apocalyptic number.

21070010 is a deficient number, since it is larger than the sum of its proper divisors (20458582).

21070010 is a wasteful number, since it uses less digits than its factorization.

21070010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 21070010 is about 4590.2080562868. The cubic root of 21070010 is about 276.1986684856.

Adding to 21070010 its reverse (1007012), we get a palindrome (22077022).

The spelling of 21070010 in words is "twenty-one million, seventy thousand, ten".