21220102010 has 16 divisors (see below), whose sum is σ = 38289580200. Its totient is φ = 8467286016.

The previous prime is 21220101979. The next prime is 21220102019. The reversal of 21220102010 is 1020102212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20369854729 + 850247281 = 142723^2 + 29159^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21220101982 and 21220102000.

It is not an unprimeable number, because it can be changed into a prime (21220102019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2590055 + ... + 2598234.

Almost surely, 2^21220102010 is an apocalyptic number.

21220102010 is a deficient number, since it is larger than the sum of its proper divisors (17069478190).

21220102010 is a wasteful number, since it uses less digits than its factorization.

21220102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188705.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220102010 its reverse (1020102212), we get a palindrome (22240204222).

The spelling of 21220102010 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, ten".