21012442010 has 64 divisors (see below), whose sum is σ = 45462104064. Its totient is φ = 6840288000.

The previous prime is 21012442001. The next prime is 21012442021. The reversal of 21012442010 is 1024421012.

It is a super-2 number, since 2×21012442010² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012442010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23660 + ... + 206360.

It is an arithmetic number, because the mean of its divisors is an integer number (710345376).

Almost surely, 2^21012442010 is an apocalyptic number.

21012442010 is an abundant number, since it is smaller than the sum of its proper divisors (24449662054).

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

21012442010 is a wasteful number, since it uses less digits than its factorization.

21012442010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182799.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21012442010 its reverse (1024421012), we get a palindrome (22036863022).

The spelling of 21012442010 in words is "twenty-one billion, twelve million, four hundred forty-two thousand, ten".