21021220002010 has 16 divisors (see below), whose sum is σ = 37888180424136. Its totient is φ = 8397380351808.

The previous prime is 21021220002007. The next prime is 21021220002031. The reversal of 21021220002010 is 1020002212012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16682985039361 + 4338234962649 = 4084481^2 + 2082843^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1388448177 + ... + 1388463316.

Almost surely, 2^{21021220002010} is an apocalyptic number.

21021220002010 is a deficient number, since it is larger than the sum of its proper divisors (16866960422126).

21021220002010 is a wasteful number, since it uses less digits than its factorization.

21021220002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776912257.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021220002010 its reverse (1020002212012), we get a palindrome (22041222214022).

The spelling of 21021220002010 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, two thousand, ten".