21021110020010 has 16 divisors (see below), whose sum is σ = 40063762626696. Its totient is φ = 7913829654528.

The previous prime is 21021110019983. The next prime is 21021110020063. The reversal of 21021110020010 is 1002001112012.

It can be written as a sum of positive squares in 4 ways, for example, as 20424370764889 + 596739255121 = 4519333^2 + 772489^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21021110019973 and 21021110020000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61826794007 + ... + 61826794346.

Almost surely, 2^{21021110020010} is an apocalyptic number.

21021110020010 is a deficient number, since it is larger than the sum of its proper divisors (19042652606686).

21021110020010 is a wasteful number, since it uses less digits than its factorization.

21021110020010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123653588377.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21021110020010 its reverse (1002001112012), we get a palindrome (22023111132022).

The spelling of 21021110020010 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, twenty thousand, ten".