21012221010 has 32 divisors (see below), whose sum is σ = 55013815872. Its totient is φ = 5093871680.

The previous prime is 21012220969. The next prime is 21012221047. The reversal of 21012221010 is 1012221012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31836369 + ... + 31837028.

It is an arithmetic number, because the mean of its divisors is an integer number (1719181746).

Almost surely, 2^21012221010 is an apocalyptic number.

21012221010 is an abundant number, since it is smaller than the sum of its proper divisors (34001594862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012221010 is a wasteful number, since it uses less digits than its factorization.

21012221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63673418.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012221010 its reverse (1012221012), we get a palindrome (22024442022).

It can be divided in two parts, 210122 and 21010, that added together give a palindrome (231132).

The spelling of 21012221010 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, ten".