21210020010010 has 32 divisors (see below), whose sum is σ = 41163008478480. Its totient is φ = 7822210963968.

The previous prime is 21210020009957. The next prime is 21210020010013. The reversal of 21210020010010 is 1001002001212.

It can be written as a sum of positive squares in 8 ways, for example, as 4683038825089 + 16526981184921 = 2164033^2 + 4065339^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21210020010013) 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, 95524515 + ... + 95746294.

Almost surely, 2^{21210020010010} is an apocalyptic number.

21210020010010 is a deficient number, since it is larger than the sum of its proper divisors (19952988468470).

21210020010010 is a wasteful number, since it uses less digits than its factorization.

21210020010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191271682.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21210020010010 its reverse (1001002001212), we get a palindrome (22211022011222).

The spelling of 21210020010010 in words is "twenty-one trillion, two hundred ten billion, twenty million, ten thousand, ten".