21210202222010 has 16 divisors (see below), whose sum is σ = 38701355288616. Its totient is φ = 8367860602368.

The previous prime is 21210202221931. The next prime is 21210202222021. The reversal of 21210202222010 is 1022220201212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19463335122529 + 1746867099481 = 4411727^2 + 1321691^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210202222010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14527535039 + ... + 14527536498.

Almost surely, 2^{21210202222010} is an apocalyptic number.

21210202222010 is a deficient number, since it is larger than the sum of its proper divisors (17491153066606).

21210202222010 is a wasteful number, since it uses less digits than its factorization.

21210202222010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29055071617.

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

Adding to 21210202222010 its reverse (1022220201212), we get a palindrome (22232422423222).

The spelling of 21210202222010 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two hundred twenty-two thousand, ten".