21022121010 has 32 divisors (see below), whose sum is σ = 55039735872. Its totient is φ = 5096271680.

The previous prime is 21022120991. The next prime is 21022121011. The reversal of 21022121010 is 1012122012.

It is not an unprimeable number, because it can be changed into a prime (21022121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31851369 + ... + 31852028.

It is an arithmetic number, because the mean of its divisors is an integer number (1719991746).

Almost surely, 2^21022121010 is an apocalyptic number.

21022121010 is an abundant number, since it is smaller than the sum of its proper divisors (34017614862).

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

21022121010 is a wasteful number, since it uses less digits than its factorization.

21022121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63703418.

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

Adding to 21022121010 its reverse (1012122012), we get a palindrome (22034243022).

The spelling of 21022121010 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, ten".