21202122221010 has 48 divisors (see below), whose sum is σ = 55125745862616. Its totient is φ = 5653875865344.

The previous prime is 21202122220991. The next prime is 21202122221053. The reversal of 21202122221010 is 1012222120212.

It is a happy number.

21202122221010 is a `hidden beast` number, since 21 + 202 + 1 + 222 + 210 + 10 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18735020589609 + 2467101631401 = 4328397^2 + 1570701^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39625582 + ... + 40157078.

Almost surely, 2^{21202122221010} is an apocalyptic number.

21202122221010 is an abundant number, since it is smaller than the sum of its proper divisors (33923623641606).

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

21202122221010 is a wasteful number, since it uses less digits than its factorization.

21202122221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974747 (or 974744 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21202122221010 its reverse (1012222120212), we get a palindrome (22214344341222).

The spelling of 21202122221010 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, two hundred twenty-one thousand, ten".