21202210210 has 16 divisors (see below), whose sum is σ = 38514108600. Its totient is φ = 8403077376.

The previous prime is 21202210151. The next prime is 21202210217. The reversal of 21202210210 is 1201220212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20697713689 + 504496521 = 143867^2 + 22461^2 .

It is not an unprimeable number, because it can be changed into a prime (21202210217) 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, 9724695 + ... + 9726874.

Almost surely, 2^21202210210 is an apocalyptic number.

21202210210 is a deficient number, since it is larger than the sum of its proper divisors (17311898390).

21202210210 is a wasteful number, since it uses less digits than its factorization.

21202210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451685.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21202210210 its reverse (1201220212), we get a palindrome (22403430422).

The spelling of 21202210210 in words is "twenty-one billion, two hundred two million, two hundred ten thousand, two hundred ten".