21101022010 has 16 divisors (see below), whose sum is σ = 38357899272. Its totient is φ = 8356840000.

The previous prime is 21101021987. The next prime is 21101022011. The reversal of 21101022010 is 1022010112.

It can be written as a sum of positive squares in 4 ways, for example, as 19460529001 + 1640493009 = 139501^2 + 40503^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21101022011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10445041 + ... + 10447060.

Almost surely, 2^21101022010 is an apocalyptic number.

21101022010 is a deficient number, since it is larger than the sum of its proper divisors (17256877262).

21101022010 is a wasteful number, since it uses less digits than its factorization.

21101022010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892209.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101022010 its reverse (1022010112), we get a palindrome (22123032122).

It can be divided in two parts, 2110102 and 2010, that added together give a palindrome (2112112).

The spelling of 21101022010 in words is "twenty-one billion, one hundred one million, twenty-two thousand, ten".