21007012010 has 8 divisors (see below), whose sum is σ = 37812621636. Its totient is φ = 8402804800.

The previous prime is 21007012007. The next prime is 21007012021. The reversal of 21007012010 is 1021070012.

It can be written as a sum of positive squares in 2 ways, for example, as 20524287169 + 482724841 = 143263^2 + 21971^2 .

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

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, 1050350591 + ... + 1050350610.

Almost surely, 2^21007012010 is an apocalyptic number.

21007012010 is a deficient number, since it is larger than the sum of its proper divisors (16805609626).

21007012010 is a wasteful number, since it uses less digits than its factorization.

21007012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100701208.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 21007012010 its reverse (1021070012), we get a palindrome (22028082022).

The spelling of 21007012010 in words is "twenty-one billion, seven million, twelve thousand, ten".