21202220210 has 8 divisors (see below), whose sum is σ = 38163996396. Its totient is φ = 8480888080.

The previous prime is 21202220201. The next prime is 21202220219. The reversal of 21202220210 is 1202220212.

It is an interprime number because it is at equal distance from previous prime (21202220201) and next prime (21202220219).

It can be written as a sum of positive squares in 2 ways, for example, as 18612326329 + 2589893881 = 136427^2 + 50891^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21202220219) 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 3 ways as a sum of consecutive naturals, for example, 1060111001 + ... + 1060111020.

Almost surely, 2^21202220210 is an apocalyptic number.

21202220210 is a deficient number, since it is larger than the sum of its proper divisors (16961776186).

21202220210 is a wasteful number, since it uses less digits than its factorization.

21202220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120222028.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202220210 its reverse (1202220212), we get a palindrome (22404440422).

It can be divided in two parts, 212022 and 20210, that added together give a palindrome (232232).

The spelling of 21202220210 in words is "twenty-one billion, two hundred two million, two hundred twenty thousand, two hundred ten".